Q: What is the sum of all factors of the number 640,250 excluding 640,250?

 A: 657,046

Why is 657,046 the sum of all factors of 640,250, excluding 640,250?

The factors of the number 640,250 are: 1, 2, 5, 10, 13, 25, 26, 50, 65, 125, 130, 197, 250, 325, 394, 650, 985, 1625, 1970, 2561, 3250, 4925, 5122, 9850, 12805, 24625, 25610, 49250, 64025, 128050, 320125, 640250.

If you add them up, you will get the total of 640,907. Now subtract 640,250 to get 657,046


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