Q: What is the sum of all factors of the number 1,140 excluding 1,140?

 A: 2,220

Why is 2,220 the sum of all factors of 1,140, excluding 1,140?

The factors of the number 1,140 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 19, 20, 30, 38, 57, 60, 76, 95, 114, 190, 228, 285, 380, 570, 1140.

If you add them up, you will get the total of 1,142. Now subtract 1,140 to get 2,220


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