Q: What is the sum of all factors of the number 720 excluding 720?

 A: 1,698

Why is 1,698 the sum of all factors of 720, excluding 720?

The factors of the number 720 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720.

If you add them up, you will get the total of 721. Now subtract 720 to get 1,698


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