7*6*5*4*3*2*1=5040
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7 factorial, (7!) is equal to 5,040.
20! = 2.432902008176 E+18
7! = 7 × 6 × 5 × ... × 2 × 1 = 5040
9 factorial = 9! = (9*8*7*6*5*4*3*2*1) = 362880
Mathematically it represents a factorial of that number. A factorial is when you take each number up to value and multiply them. So factorial 5 is 1 x 2 x 3 x 4 x 5. Factorial 11 is 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11. This is often written with the number you are getting the factorial for, followed by an exclamation mark.