Factorial of 20 (20!)
RESULT: 2,432,902,008,176,640,000
The factorial of 20, written as 20!, is the product of all positive integers less than or equal to 20.
What Is the Formula to Calculate 20 Factorial?
The formula for calculating 20 factorial (20!) is:
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
How Many Digits in 20 Factorial?
The number 20! has 19 digits.
Factorial Table From 1! to 20!
| n | n! |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5,040 |
| 8 | 40,320 |
| 9 | 362,880 |
| 10 | 3,628,800 |
Frequently Asked Questions
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What is 20!?
It's the product of all positive integers from 1 to 20. Answer: 2,432,902,008,176,640,000.
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Is factorial defined for negative numbers?
No. Factorials are only defined for non-negative integers (0 and up).
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What is 0!?
By definition, the factorial of 0 is 1.