Factorial of 20

We write the factorial of a number using an exclamation mark (!) after it.

If n is a natural number greater than or equal to 1, then: n! = n × (n - 1) × (n - 2) × (n - 3) × … × 3 × 2 × 1

To find the factorial of 20, we write it as: 20! = 20 × 19 × 18 × 17 × 16 × 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 2,432,902,008,176,640,000.

Therefore, the factorial of 20 is 2,432,902,008,176,640,000.

• Factorial: The process of multiplying all the natural numbers smaller than or equal to a given number is known as factorial, and it is expressed with an exclamation mark (!).

• Natural numbers: Counting numbers starting from 1, 2, 3, and so on.

• Permutation: A way to arrange a set of numbers or objects, often calculated using factorials.

• Combinatorics: A branch of mathematics dealing with combinations and arrangements, frequently using factorials.

• Exponential growth: A process that increases rapidly, similar to how factorial values grow with larger numbers.