Q: What is the sum of all factors of the number 644,920 excluding 644,920?
A: 871,400
The factors of the number 644,920 are: 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 701, 920, 1402, 2804, 3505, 5608, 7010, 14020, 16123, 28040, 32246, 64492, 80615, 128984, 161230, 322460, 644920.
If you add them up, you will get the total of 645,791. Now subtract 644,920 to get 871,400