Q: What is the sum of all factors of the number 20,509 excluding 20,509?

 A: 1

Why is 1 the sum of all factors of 20,509, excluding 20,509?

The factors of the number 20,509 are: 1, 20509.

If you add them up, you will get the total of 20,510. Now subtract 20,509 to get 1


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