A number when doubled means it has been multiplied by 2.
0 x 2 = 0 : 1 x 2 = 2 : 2 x 2 = 4 : 3 x 2 + 6 : 4 x 2 + 8 : 5 x 2 + 10
6 x 2 = 12 : 7 x 2 = 14 : 8 x 2 = 16 : 9 x 2 = 18 : 10 x 2 = 20
11 x 2 = 22 : 12 x 2 = 24 : 13 x 2 + 26 : 14 x 2 = 28 : 15 x 2 = 30
16 x 2 = 32 : 17 x 2 = 34 : 18 x 2 = 36 : 19 x 2 = 38 : 20 x 2 = 40
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The prime factors of 20 are 2x2x5.
There is an infinite amount of numbers divisible by 20, however it starts off as 20,40,60,80,100,120,140,160,180,200...
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
All whole numbers between 1 and 400 (=20 square).
10,12,14,15,16,18, and 20 dumbshit
All the numbers from 2 to 19 are multiples of prime numbers.
The counting numbers from 1 to 20 are called natural numbers. There are larger sets that include the numbers from 1 to 20, but have other members as well. For example, the integers contain 1 through 20, but also all numbers 21, 22, 23, ... The set of real numbers includes all numbers on the number line, which includes 0 and negative numbers and irrational numbers like pi, but also includes 1 through 20. Etc.
14=14 and 20=20 All numbers have different values, and the only number equal to itself is itself.
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1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400 All the square numbers up to 20!
All of them except for 23 and 29 which are prime numbers.
Each of the numbers are exactly divisible by 20. They are all multiples of 20.
2,3,5,7,11,13,17,19
11,13,17,19
all numbers greater than 20! 21,22,23,24,25,26,27,28,29,30,31....infinity
Technically, the number 20 can be divided by any number except zero. If you are asking for all the factors of 20 (all the numbers that will divide 20 into whole numbers), they are 1, 2, 4, 5, 10, and 20.