Q: What is the sum of all factors of the number 500,400 excluding 500,400?

Why is 1,248,620 the sum of all factors of 500,400, excluding 500,400?

The factors of the number 500,400 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 30, 36, 40, 45, 48, 50, 60, 72, 75, 80, 90, 100, 120, 139, 144, 150, 180, 200, 225, 240, 278, 300, 360, 400, 417, 450, 556, 600, 695, 720, 834, 900, 1112, 1200, 1251, 1390, 1668, 1800, 2085, 2224, 2502, 2780, 3336, 3475, 3600, 4170, 5004, 5560, 6255, 6672, 6950, 8340, 10008, 10425, 11120, 12510, 13900, 16680, 20016, 20850, 25020, 27800, 31275, 33360, 41700, 50040, 55600, 62550, 83400, 100080, 125100, 166800, 250200, 500400.

If you add them up, you will get the total of 500,401. Now subtract 500,400 to get 1,248,620

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