The factorial of 20, denoted as 20!, is the product of all positive integers from 1 to 20.
Calculating it step by step:
20! = 20 × 19 × 18 × 17 × 16 × 15 × 14 × 13 × 12 × 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
This is a very large number, and its exact value is 2,432,902,008,176,640,000. Factorials grow very quickly with increasing numbers, which is why 20! is quite substantial.
Factorials are commonly used in mathematics, especially in permutations, combinations, and other areas of algebra. Knowing how to calculate them is essential when dealing with problems involving arrangements or selections of groups.