How many different primes appear in the prime factorization of 20! + 25! ?
20! + 25! ==1.551121247623299416064e+25 = 2^18 * 3^8 * 5^4 * 7^2 * 11 * 13 * 17 * 19 * 73 * 87337
There are 10 DISTINCT primes
