Q: What is the sum of all factors of the number 1,278,300 excluding 1,278,300?

Why is 2,421,116 the sum of all factors of 1,278,300, excluding 1,278,300?

The factors of the number 1,278,300 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 150, 300, 4261, 8522, 12783, 17044, 21305, 25566, 42610, 51132, 63915, 85220, 106525, 127830, 213050, 255660, 319575, 426100, 639150, 1278300.

If you add them up, you will get the total of 1,278,302. Now subtract 1,278,300 to get 2,421,116

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