Q: What is the sum of all factors of the number 72,301,680 excluding 72,301,680?

Why is 216,965,520 the sum of all factors of 72,301,680, excluding 72,301,680?

The factors of the number 72,301,680 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16, 17, 18, 20, 22, 24, 27, 30, 33, 34, 36, 40, 44, 45, 48, 51, 54, 55, 60, 66, 68, 72, 80, 85, 88, 90, 99, 102, 108, 110, 120, 132, 135, 136, 144, 153, 165, 170, 176, 179, 180, 187, 198, 204, 216, 220, 240, 255, 264, 270, 272, 297, 306, 330, 340, 358, 360, 374, 396, 408, 432, 440, 459, 495, 510, 528, 537, 540, 561, 594, 612, 660, 680, 716, 720, 748, 765, 792, 816, 880, 895, 918, 935, 990, 1020, 1074, 1080, 1122, 1188, 1224, 1320, 1360, 1432, 1485, 1496, 1530, 1584, 1611, 1683, 1790, 1836, 1870, 1969, 1980, 2040, 2148, 2160, 2244, 2295, 2376, 2448, 2640, 2685, 2805, 2864, 2970, 2992, 3043, 3060, 3222, 3366, 3580, 3672, 3740, 3938, 3960, 4080, 4296, 4488, 4590, 4752, 4833, 5049, 5370, 5610, 5907, 5940, 6086, 6120, 6444, 6732, 7160, 7344, 7480, 7876, 7920, 8055, 8415, 8592, 8976, 9129, 9180, 9666, 9845, 10098, 10740, 11220, 11814, 11880, 12172, 12240, 12888, 13464, 14320, 14960, 15215, 15752, 16110, 16830, 17721, 18258, 18360, 19332, 19690, 20196, 21480, 22440, 23628, 23760, 24165, 24344, 25245, 25776, 26928, 27387, 29535, 30430, 31504, 32220, 33473, 33660, 35442, 36516, 36720, 38664, 39380, 40392, 42960, 44880, 45645, 47256, 48330, 48688, 50490, 53163, 54774, 59070, 60860, 64440, 66946, 67320, 70884, 73032, 77328, 78760, 80784, 82161, 88605, 91290, 94512, 96660, 100419, 100980, 106326, 109548, 118140, 121720, 128880, 133892, 134640, 136935, 141768, 146064, 157520, 164322, 167365, 177210, 182580, 193320, 200838, 201960, 212652, 219096, 236280, 243440, 265815, 267784, 273870, 283536, 301257, 328644, 334730, 354420, 365160, 386640, 401676, 403920, 410805, 425304, 438192, 472560, 502095, 531630, 535568, 547740, 602514, 657288, 669460, 708840, 730320, 803352, 821610, 850608, 903771, 1004190, 1063260, 1095480, 1205028, 1314576, 1338920, 1417680, 1506285, 1606704, 1643220, 1807542, 2008380, 2126520, 2190960, 2410056, 2677840, 3012570, 3286440, 3615084, 4016760, 4253040, 4518855, 4820112, 6025140, 6572880, 7230168, 8033520, 9037710, 12050280, 14460336, 18075420, 24100560, 36150840, 72301680.

If you add them up, you will get the total of 72,301,896. Now subtract 72,301,680 to get 216,965,520

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