Q: What is the sum of all factors of the number 777,720 excluding 777,720?

Why is 1,555,800 the sum of all factors of 777,720, excluding 777,720?

The factors of the number 777,720 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 6481, 12962, 19443, 25924, 32405, 38886, 51848, 64810, 77772, 97215, 129620, 155544, 194430, 259240, 388860, 777720.

If you add them up, you will get the total of 777,721. Now subtract 777,720 to get 1,555,800

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