16
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16 has five factors.
4 and 9
6, 8, 10, 14, 15
It's a tie between 12 and 18. Each of them has 6 factors. Factors of 12: 1, 2, 3, 4, 6, and 12. Factors of 18: 1, 2, 3, 6, 9, and 18.
The prime numbers between 1 and 20 are: 2, 3, 5, 7, 11, 13, 17 and 19. Note that a prime number has only two factors, 1 and itself and one. Number 1 is not considered to be a prime number because it has only one factor.