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General Information, Facts & Tables
[Factorials 1 - 20]

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Overview

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The factorial of a number is the multiplication of all of the integers up to and including itself.
eg 5! = 1 * 2 * 3 * 4 * 5 = 120
 

Factorials 1 - 20

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n!

Factorial

1/n! (Reciprocal of factor)

1

1

 1.000 000 000 000 000 000 00

2

2

 0.500 000 000 000 000 000 00

3

6

 0.166 666 666 666 667 000 00

4

24

 0.041 666 666 666 666 700 00

5

120

 0.008 333 333 333 333 330 00

6

720

 0.001 388 888 888 888 890 00

7

5 040

 0.000 198 412 698 412 698 00

8

40 320

 0.000 024 801 587 301 587 30

9

362 880

 0.000 002 755 731 922 398 59

10

3 628 800

 0.000 000 275 573 192 239 86

11

39 916 800

 0.000 000 025 052 108 385 44

12

479 001 600

 0.000 000 002 087 675 698 79

13

6 227 020 800

 0.000 000 000 160 590 438 37

14

87 178 291 200

 0.000 000 000 011 470 745 60

15

1 307 674 368 000

 0.000 000 000 000 764 716 37

16

20 922 789 888 000

 0.000 000 000 000 047 794 77

17

355 687 428 096 000

 0.000 000 000 000 002 811 46

18

6 402 373 705 728 000

 0.000 000 000 000 000 156 19

19

121 645 100 408 832 000

 0.000 000 000 000 000 008 22

20

 2 432 902 008 176 640 000

 0.000 000 000 000 000 000 41