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Solution:
A factorial of a number is the function that multiplies the number by everynatural numberbelow it.
The Factorial of n is denoted by n!
If n is an natural number greater than or equal to 1, then
n! = n ×(n - 1) ×(n - 2)×(n - 3)×...×3 ×2 ×1
Therefore, 20! = 20× 19× 18× 17×...×3 ×2 ×1 =2432902008176640000
Thus, the factorial of 20 is 2432902008176640000.
Summary:
The factorial of 20is 2432902008176640000.
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