Q: What is the sum of all factors of the number 840,120 excluding 840,120?

Why is 1,680,600 the sum of all factors of 840,120, excluding 840,120?

The factors of the number 840,120 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 7001, 14002, 21003, 28004, 35005, 42006, 56008, 70010, 84012, 105015, 140020, 168024, 210030, 280040, 420060, 840120.

If you add them up, you will get the total of 840,121. Now subtract 840,120 to get 1,680,600

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