Q: What is the sum of all factors of the number 20,391 excluding 20,391?

 A: 10,713

Why is 10,713 the sum of all factors of 20,391, excluding 20,391?

The factors of the number 20,391 are: 1, 3, 7, 21, 971, 2913, 6797, 20391.

If you add them up, you will get the total of 20,401. Now subtract 20,391 to get 10,713


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