20! = 2.432902008176 E+18
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1.1053
Twenty factorial which is denoted by "20!". 20! = 1x2x3x4x5x6x7x8x...x19x20
The number of permutations of 20 things taken 20 at a time is 20 factorial or 2,432,902,008,176,640,000.
factorial of -1
Factorial 6 = 720