HELP: THX

8.

A prime number will only come up in the factorization of a factorial if the prime is less than n, with n being (n)!. THere are 8 primes less than 20- 2, 3, 5, 7, 11, 13, 17, and 19.

That's great, you rock!

20! = 2^18 * 3^8 * 5^4 * 7^2 * 11 * 13 * 17 * 19