The factors of the number 8,601,840 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 20, 24, 26, 30, 36, 39, 40, 45, 48, 52, 60, 65, 72, 78, 80, 90, 104, 117, 120, 130, 144, 156, 180, 195, 208, 234, 240, 260, 312, 360, 390, 468, 520, 585, 624, 720, 780, 919, 936, 1040, 1170, 1560, 1838, 1872, 2340, 2757, 3120, 3676, 4595, 4680, 5514, 7352, 8271, 9190, 9360, 11028, 11947, 13785, 14704, 16542, 18380, 22056, 23894, 27570, 33084, 35841, 36760, 41355, 44112, 47788, 55140, 59735, 66168, 71682, 73520, 82710, 95576, 107523, 110280, 119470, 132336, 143364, 165420, 179205, 191152, 215046, 220560, 238940, 286728, 330840, 358410, 430092, 477880, 537615, 573456, 661680, 716820, 860184, 955760, 1075230, 1433640, 1720368, 2150460, 2867280, 4300920, 8601840.
If you add them up, you will get the total of 31,143,840.