Q: What is the sum of all factors of the number 1,560 excluding 1,560?

 A: 3,480

Why is 3,480 the sum of all factors of 1,560, excluding 1,560?

The factors of the number 1,560 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 104, 120, 130, 156, 195, 260, 312, 390, 520, 780, 1560.

If you add them up, you will get the total of 1,563. Now subtract 1,560 to get 3,480


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