Q: What is the sum of all factors of the number 20,720,521 excluding 20,720,521?

 A: 1

Why is 1 the sum of all factors of 20,720,521, excluding 20,720,521?

The factors of the number 20,720,521 are: 1, 20720521.

If you add them up, you will get the total of 20,720,522. Now subtract 20,720,521 to get 1


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