Q: What is the sum of all factors of the number 21,991 excluding 21,991?

 A: 1

Why is 1 the sum of all factors of 21,991, excluding 21,991?

The factors of the number 21,991 are: 1, 21991.

If you add them up, you will get the total of 21,992. Now subtract 21,991 to get 1


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