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answered May 21, 2020 at 8:10

APL (Dyalog Unicode), 4 bytes

I was just copying Bubbler's solution. I didn't write it, so it's community wiki.

!⍣¯1

 ⍣¯1 The inverse of this function: ! Factorial function

answered May 21, 2020 at 8:10

user92069