The factors of the number 21,560,400 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 30, 36, 40, 45, 48, 50, 53, 60, 72, 75, 80, 90, 100, 106, 113, 120, 144, 150, 159, 180, 200, 212, 225, 226, 240, 265, 300, 318, 339, 360, 400, 424, 450, 452, 477, 530, 565, 600, 636, 678, 720, 795, 848, 900, 904, 954, 1017, 1060, 1130, 1200, 1272, 1325, 1356, 1590, 1695, 1800, 1808, 1908, 2034, 2120, 2260, 2385, 2544, 2650, 2712, 2825, 3180, 3390, 3600, 3816, 3975, 4068, 4240, 4520, 4770, 5085, 5300, 5424, 5650, 5989, 6360, 6780, 7632, 7950, 8136, 8475, 9040, 9540, 10170, 10600, 11300, 11925, 11978, 12720, 13560, 15900, 16272, 16950, 17967, 19080, 20340, 21200, 22600, 23850, 23956, 25425, 27120, 29945, 31800, 33900, 35934, 38160, 40680, 45200, 47700, 47912, 50850, 53901, 59890, 63600, 67800, 71868, 81360, 89835, 95400, 95824, 101700, 107802, 119780, 135600, 143736, 149725, 179670, 190800, 203400, 215604, 239560, 269505, 287472, 299450, 359340, 406800, 431208, 449175, 479120, 539010, 598900, 718680, 862416, 898350, 1078020, 1197800, 1347525, 1437360, 1796700, 2156040, 2395600, 2695050, 3593400, 4312080, 5390100, 7186800, 10780200, 21560400.
If you add them up, you will get the total of 76,906,908.