The factors of the number 20,223,840 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 15, 16, 20, 21, 24, 26, 28, 30, 32, 35, 39, 40, 42, 48, 52, 56, 60, 65, 70, 78, 80, 84, 91, 96, 104, 105, 112, 120, 130, 140, 156, 160, 168, 182, 195, 208, 210, 224, 240, 260, 273, 280, 312, 336, 364, 390, 416, 420, 455, 463, 480, 520, 546, 560, 624, 672, 728, 780, 840, 910, 926, 1040, 1092, 1120, 1248, 1365, 1389, 1456, 1560, 1680, 1820, 1852, 2080, 2184, 2315, 2730, 2778, 2912, 3120, 3241, 3360, 3640, 3704, 4368, 4630, 5460, 5556, 6019, 6240, 6482, 6945, 7280, 7408, 8736, 9260, 9723, 10920, 11112, 12038, 12964, 13890, 14560, 14816, 16205, 18057, 18520, 19446, 21840, 22224, 24076, 25928, 27780, 30095, 32410, 36114, 37040, 38892, 42133, 43680, 44448, 48152, 48615, 51856, 55560, 60190, 64820, 72228, 74080, 77784, 84266, 90285, 96304, 97230, 103712, 111120, 120380, 126399, 129640, 144456, 155568, 168532, 180570, 192608, 194460, 210665, 222240, 240760, 252798, 259280, 288912, 311136, 337064, 361140, 388920, 421330, 481520, 505596, 518560, 577824, 631995, 674128, 722280, 777840, 842660, 963040, 1011192, 1263990, 1348256, 1444560, 1555680, 1685320, 2022384, 2527980, 2889120, 3370640, 4044768, 5055960, 6741280, 10111920, 20223840.
If you add them up, you will get the total of 78,575,616.