Q: What is the sum of all factors of the number 387,640 excluding 387,640?

 A: 564,920

Why is 564,920 the sum of all factors of 387,640, excluding 387,640?

The factors of the number 387,640 are: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440, 881, 1762, 3524, 4405, 7048, 8810, 9691, 17620, 19382, 35240, 38764, 48455, 77528, 96910, 193820, 387640.

If you add them up, you will get the total of 388,204. Now subtract 387,640 to get 564,920


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