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Solution:
A factorial of a number is the function that multiplies the number by every natural number below 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 20 is 2432902008176640000.