The factors of the number 620,505,408 are: 1, 2, 3, 4, 6, 8, 12, 16, 23, 24, 32, 46, 48, 64, 69, 92, 96, 138, 184, 192, 227, 276, 368, 454, 552, 619, 681, 736, 908, 1104, 1238, 1362, 1472, 1816, 1857, 2208, 2476, 2724, 3632, 3714, 4416, 4952, 5221, 5448, 7264, 7428, 9904, 10442, 10896, 14237, 14528, 14856, 15663, 19808, 20884, 21792, 28474, 29712, 31326, 39616, 41768, 42711, 43584, 56948, 59424, 62652, 83536, 85422, 113896, 118848, 125304, 140513, 167072, 170844, 227792, 250608, 281026, 334144, 341688, 421539, 455584, 501216, 562052, 683376, 843078, 911168, 1002432, 1124104, 1366752, 1686156, 2248208, 2733504, 3231799, 3372312, 4496416, 6463598, 6744624, 8992832, 9695397, 12927196, 13489248, 19390794, 25854392, 26978496, 38781588, 51708784, 77563176, 103417568, 155126352, 206835136, 310252704, 620505408.
If you add them up, you will get the total of 1,723,461,120.