Onel No. 16 has five (odd) number of factors.
10 ;; 1 , 2,5,10 (4)
11 l 1,11(2)
12; 1,2,3,4,6,12)6)
13; 1,13(2)
114; 1,2,7,14 (4)
15;1,3,5,15, (4)
16; 1,2,4,8,16 )5)
17; 1,17.
18; 1,2,3,6,9,18 (6)
19; 1,19 (2)
20; 1,2,4,5,10.20(6)
The factors of 20 are 1,2,4,5,10 and 20. Two are odd, four are even.
1 and 5 are the factors of 20 which are odd.
10 is such a number.
The answer is 105 because 3,5, and 7 are all prime factors and when you multiply the numbers together it comes out to be 10
11, 13, 15, 17, and 19 does.
The factors of 20 are 1, 2, 4, 5, 10, and 20
30
Well, darling, the number you're looking for is 15. It's less than 20, odd, and can be broken down into the prime factors 3 and 5. So, there you have it, a prime factor party with the number 15 strutting its stuff.
21
It is 14/20 or 7/10.
Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
1 and 5 are.By an odd coincidence, those same numbers arealso the lowest common factors of 15, 10 and 20 .