1+8=9, 9x2=18 so 18 is one answer to this problem
Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.
Eighteen
27
Split the number into its alternate digits.Sum the digits in each setIf the difference between their sums is zero (0) or divisible by 11 then the original number is divisible by 11.ExamplesIs 1289324 divisible by 11?Split into alternate digits: 1_8_3_4 and _2_9_2 Sum each set of digits:1_8_3_4 -> 1+8+3+4 = 16_2_9_2 -> 2+9+2 = 13Difference between the sums: 16 - 13 = 3, not divisible by 11; so original number 1289324 is not divisible by 11.Is 19407278 divisible by 11?Split into alternate digits: 1_4_7_7 and _9_8_2_6 Sum each set of digits:1_4_7_7 -> 1+4+7+7 = 19_9_0_2_8 -> 9+0+2+8 = 19Difference between the sums: 19 - 19 = 0; so original number 19407278 is divisible by 11.
27
36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.
18. The sum of its digits is 9. And yes, it is unique.
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. The sum of all digits is 45.
The largest digits number with only 2 digits alike is 99
27 2+7=9 9x3=27
1. its even 2.its a number 3.its pretty the sum of its digits times 2 equals 18
5: The number ends in 0 or 5 25: The number ends in 00, 25, 50 or 75 125: The number ends in 000, 125, 250, 375, 500, 625, 750 or 875 625: The last 4 digits are a multiple of 625 The 1,000s digit is 0 or 5 and the last 3 digits are 000 or 625 The 1,000s digit is 1 or 6 and the last 3 digits are 250 or 875 The 1,000s digit is 2 or 7 and the last 3 digits are 500 The 1,000s digit is 3 or 8 and the last 3 digits are 125 or 750 The 1,000s digit is 4 or 9 and the last 3 digits are 375 3,125: The last 5 digits are a multiple of 3,125 The 10,000s digit is 0 or 5 and the last 4 digits are a multiple of 3,125 The 10,000s digit is 1 or 6 and the last 4 digits are 625 times a number that ends in 4 or 9 The 10,000s digit is 2 or 7 and the last 4 digits are 625 times a number that ends in 3 or 8 The 10,000s digit is 3 or 8 and the last 4 digits are 625 times a number that ends in 2 or 7 The 10,000s digit is 4 or 9 and the last 4 digits are 625 times a number that ends in 1 or 6 15,625: The last 6 digits are a multiple of 15,625 The 100,000s digit is 0 or 5 and the last 5 digits are a multiple of 15,625 The 100,000s digit is 1 or 6 and the last 5 digits are 3,125 times a number that ends in 3 or 8 The 100,000s digit is 2 or 7 and the last 5 digits are 3,125 times a number that ends in 1 or 6 The 100,000s digit is 3 or 8 and the last 5 digits are 3,125 times a number that ends in 4 or 9 The 100,000s digit is 4 or 9 and the last 5 digits are 3,125 times a number that ends in 2 or 7 78,125: The last 7 digits are a multiple of 78,125 The 1,000,000s digit is 0 or 5 and the last 6 digits are a multiple of 78,125 The 1,000,000s digit is 1 or 6 and the last 6 digits are 15,625 times a number that ends in 1 or 6 The 1,000,000s digit is 2 or 7 and the last 6 digits are 15,625 times a number that ends in 2 or 7 The 1,000,000s digit is 3 or 8 and the last 6 digits are 15,625 times a number that ends in 3 or 8 The 1,000,000s digit is 4 or 9 and the last 6 digits are 15,625 times a number that ends in 4 or 9 390,625: The last 8 digits are a multiple of 390,625 The 10,000,000s digit is 0 or 5 and the last 7 digits are a multiple of 390,625 The 10,000,000s digit is 1 or 6 and the last 7 digits are 78,125 times a number that ends in 2 or 7 The 10,000,000s digit is 2 or 7 and the last 7 digits are 78,125 times a number that ends in 4 or 9 The 10,000,000s digit is 3 or 8 and the last 7 digits are 78,125 times a number that ends in 1 or 6 The 10,000,000s digit is 4 or 9 and the last 7 digits are 78,125 rimes a number that ends in 3 or 8 1,953,125: The last 9 digits are a multiple of 1,953,125 The 100,000,000s digit is 0 or 5 and the last 8 digits are a multiple of 1,953,125 The 100,000,000s digit is 1 or 6 and the last 8 digits are 390,625 times a number that ends in 4 or 9 The 100,000,000s digit is 2 or 7 and the last 8 digits are 390,625 times a number that ends in 3 or 8 The 100,000,000s digit is 3 or 8 and the last 8 digits are 390,625 times a number that ends in 2 or 7 The 100,000,000s digit is 4 or 9 and the last 8 digits are 390,625 times a number that ends in 1 or 6 9,765,625: The last 10 digits are a multiple of 9,765,625 The 1,000,000,000s digit is 0 or 5 and the last 9 digits are a multiple of 9,765,625 The 1,000,000,000s digit is 1 or 6 and the last 9 digits are 1,953,125 times a number that ends in 3 or 8 The 1,000,000,000s digit is 2 or 7 and the last 9 digits are 1,953,125 times a number that ends in 1 or 6 The 1,000,000,000s digit is 3 or 8 and the last 9 digits are 1,953,125 times a number that ends in 4 or 9 The 1,000,000,000s digit is 4 or 9 and the last 9 digits are 1,953,125 times a number that ends in 2 or 7