Q: What is the sum of all factors of the number 20,711 excluding 20,711?

 A: 289

Why is 289 the sum of all factors of 20,711, excluding 20,711?

The factors of the number 20,711 are: 1, 139, 149, 20711.

If you add them up, you will get the total of 21,000. Now subtract 20,711 to get 289


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