Q: What is the sum of all factors of the number 400,780 excluding 400,780?

 A: 471,140

Why is 471,140 the sum of all factors of 400,780, excluding 400,780?

The factors of the number 400,780 are: 1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 691, 1382, 2764, 3455, 6910, 13820, 20039, 40078, 80156, 100195, 200390, 400780.

If you add them up, you will get the total of 401,251. Now subtract 400,780 to get 471,140


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