What is the factorial of 20?

1 Answer
George C.
Dec 3, 2015

20! = 20 xx 19 xx 18 xx ... xx 2 xx 1 = 2432902008176640000

~~ 2.4329 xx 10^18

Explanation:

n! grows a little bit faster than sqrt(n^n), but slower than n^n

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