20! = 2.432902008176 E+18
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7*6*5*4*3*2*1=5040
It is 4060.
A little over 100, although mathematicians disagree over it's exact value.
example: 5 factorial notation is 5x4x3x2x1= ______that's factorial notationIt is written as 5!
88 factorial = 1.8548 * 10134 (approx)