Q: What is the sum of all factors of the number 920 excluding 920?

 A: 1,240

Why is 1,240 the sum of all factors of 920, excluding 920?

The factors of the number 920 are: 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920.

If you add them up, you will get the total of 921. Now subtract 920 to get 1,240


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