Q: What is the sum of all factors of the number 12,255 excluding 12,255?

 A: 8,865

Why is 8,865 the sum of all factors of 12,255, excluding 12,255?

The factors of the number 12,255 are: 1, 3, 5, 15, 19, 43, 57, 95, 129, 215, 285, 645, 817, 2451, 4085, 12255.

If you add them up, you will get the total of 12,263. Now subtract 12,255 to get 8,865


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