Q: What is the sum of all factors of the number 21,901 excluding 21,901?

 A: 2,305

Why is 2,305 the sum of all factors of 21,901, excluding 21,901?

The factors of the number 21,901 are: 1, 11, 121, 181, 1991, 21901.

If you add them up, you will get the total of 21,903. Now subtract 21,901 to get 2,305


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