The factors of the number 620,000,640 are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 28, 30, 32, 35, 36, 40, 42, 45, 48, 56, 60, 63, 64, 70, 72, 80, 84, 90, 96, 105, 112, 120, 126, 128, 140, 144, 160, 168, 180, 192, 210, 224, 240, 252, 280, 288, 315, 320, 336, 360, 384, 420, 448, 480, 504, 560, 576, 630, 640, 672, 720, 840, 896, 960, 1008, 1120, 1152, 1260, 1344, 1440, 1680, 1920, 2016, 2240, 2520, 2688, 2880, 3360, 4032, 4480, 5040, 5760, 6720, 8064, 10080, 13440, 15377, 20160, 30754, 40320, 46131, 61508, 76885, 92262, 107639, 123016, 138393, 153770, 184524, 215278, 230655, 246032, 276786, 307540, 322917, 369048, 430556, 461310, 492064, 538195, 553572, 615080, 645834, 691965, 738096, 861112, 922620, 968751, 984128, 1076390, 1107144, 1230160, 1291668, 1383930, 1476192, 1614585, 1722224, 1845240, 1937502, 1968256, 2152780, 2214288, 2460320, 2583336, 2767860, 2952384, 3229170, 3444448, 3690480, 3875004, 4305560, 4428576, 4843755, 4920640, 5166672, 5535720, 5904768, 6458340, 6888896, 7380960, 7750008, 8611120, 8857152, 9687510, 9841280, 10333344, 11071440, 12916680, 13777792, 14761920, 15500016, 17222240, 17714304, 19375020, 20666688, 22142880, 25833360, 29523840, 31000032, 34444480, 38750040, 41333376, 44285760, 51666720, 62000064, 68888960, 77500080, 88571520, 103333440, 124000128, 155000160, 206666880, 310000320, 620000640.
If you add them up, you will get the total of 2,446,947,360.