The factors of the number 6,355,620 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 17, 18, 20, 30, 31, 34, 36, 45, 51, 60, 62, 67, 68, 85, 90, 93, 102, 124, 134, 153, 155, 170, 180, 186, 201, 204, 255, 268, 279, 306, 310, 335, 340, 372, 402, 465, 510, 527, 558, 603, 612, 620, 670, 765, 804, 930, 1005, 1020, 1054, 1116, 1139, 1206, 1340, 1395, 1530, 1581, 1860, 2010, 2077, 2108, 2278, 2412, 2635, 2790, 3015, 3060, 3162, 3417, 4020, 4154, 4556, 4743, 5270, 5580, 5695, 6030, 6231, 6324, 6834, 7905, 8308, 9486, 10251, 10385, 10540, 11390, 12060, 12462, 13668, 15810, 17085, 18693, 18972, 20502, 20770, 22780, 23715, 24924, 31155, 31620, 34170, 35309, 37386, 41004, 41540, 47430, 51255, 62310, 68340, 70618, 74772, 93465, 94860, 102510, 105927, 124620, 141236, 176545, 186930, 205020, 211854, 317781, 353090, 373860, 423708, 529635, 635562, 706180, 1059270, 1271124, 1588905, 2118540, 3177810, 6355620.
If you add them up, you will get the total of 21,385,728.