5, 10, 15 and 20 have five as a factor. The number 16 has five factors.
There are no factors of 10 between 20 and 100.
1,11,12,13,14,15,16,17,18,19,2,6,7,8,9,3,4,5, those r some of the factors between 10 and 20
6, 8, 10, 14, 15
Because they only have two factors, as do 17 and 19.
The only composite factor of 10 is 10. The composite factors of 20 are 4, 10, 20
20 and 28 both have six factors.
The factors of 16 are 1, 2, 4, 8, and 16.
Well say the number was 10 you find the factors (1,2,5,10) then out of those numbers you pick the prime number/s 2 and 10. For 20 , the factors are 1,2,4,5,10 and 20 so the prime factors are 2, and 5 again
6, 8, 10, 14, 15
20 does.
20