Q: What is the sum of all factors of the number 20,921 excluding 20,921?

 A: 1

Why is 1 the sum of all factors of 20,921, excluding 20,921?

The factors of the number 20,921 are: 1, 20921.

If you add them up, you will get the total of 20,922. Now subtract 20,921 to get 1


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