Q: What is the sum of all factors of the number 21,905 excluding 21,905?

 A: 6,487

Why is 6,487 the sum of all factors of 21,905, excluding 21,905?

The factors of the number 21,905 are: 1, 5, 13, 65, 337, 1685, 4381, 21905.

If you add them up, you will get the total of 21,911. Now subtract 21,905 to get 6,487


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