Q: What is the sum of all factors of the number 100,720 excluding 100,720?

 A: 133,640

Why is 133,640 the sum of all factors of 100,720, excluding 100,720?

The factors of the number 100,720 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1259, 2518, 5036, 6295, 10072, 12590, 20144, 25180, 50360, 100720.

If you add them up, you will get the total of 100,853. Now subtract 100,720 to get 133,640


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