Q: What is the sum of all factors of the number 257,720 excluding 257,720?

 A: 357,880

Why is 357,880 the sum of all factors of 257,720, excluding 257,720?

The factors of the number 257,720 are: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 379, 680, 758, 1516, 1895, 3032, 3790, 6443, 7580, 12886, 15160, 25772, 32215, 51544, 64430, 128860, 257720.

If you add them up, you will get the total of 258,077. Now subtract 257,720 to get 357,880


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