The factors of the number 20,632,320 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 27, 30, 32, 36, 40, 45, 48, 54, 60, 64, 72, 80, 81, 90, 96, 108, 120, 128, 135, 144, 160, 162, 180, 192, 199, 216, 240, 256, 270, 288, 320, 324, 360, 384, 398, 405, 432, 480, 540, 576, 597, 640, 648, 720, 768, 796, 810, 864, 960, 995, 1080, 1152, 1194, 1280, 1296, 1440, 1592, 1620, 1728, 1791, 1920, 1990, 2160, 2304, 2388, 2592, 2880, 2985, 3184, 3240, 3456, 3582, 3840, 3980, 4320, 4776, 5184, 5373, 5760, 5970, 6368, 6480, 6912, 7164, 7960, 8640, 8955, 9552, 10368, 10746, 11520, 11940, 12736, 12960, 14328, 15920, 16119, 17280, 17910, 19104, 20736, 21492, 23880, 25472, 25920, 26865, 28656, 31840, 32238, 34560, 35820, 38208, 42984, 47760, 50944, 51840, 53730, 57312, 63680, 64476, 71640, 76416, 80595, 85968, 95520, 103680, 107460, 114624, 127360, 128952, 143280, 152832, 161190, 171936, 191040, 214920, 229248, 254720, 257904, 286560, 322380, 343872, 382080, 429840, 458496, 515808, 573120, 644760, 687744, 764160, 859680, 1031616, 1146240, 1289520, 1375488, 1719360, 2063232, 2292480, 2579040, 3438720, 4126464, 5158080, 6877440, 10316160, 20632320.
If you add them up, you will get the total of 74,197,200.