If a number ends in zeroes, the zeroes are called terminal zeroes.

Question

For example, 520,000 has four terminal zeroes, but 502,000 has just 3. Let X equal the product of all natural numbers from 1 to 20.
N = 1 * 2 * 3... *20.
How many terminal zeroes will N have when it is written in standard form?

Answer 1

Scratch that. Never mind.