Q: What is the sum of all factors of the number 12,906 excluding 12,906?

 A: 15,894

Why is 15,894 the sum of all factors of 12,906, excluding 12,906?

The factors of the number 12,906 are: 1, 2, 3, 6, 9, 18, 27, 54, 239, 478, 717, 1434, 2151, 4302, 6453, 12906.

If you add them up, you will get the total of 12,921. Now subtract 12,906 to get 15,894


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