Q: What is the sum of all factors of the number 1,240 excluding 1,240?

 A: 1,640

Why is 1,640 the sum of all factors of 1,240, excluding 1,240?

The factors of the number 1,240 are: 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240.

If you add them up, you will get the total of 1,241. Now subtract 1,240 to get 1,640


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