The factors of the number 640,534,560 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 80, 96, 120, 160, 240, 480, 1021, 1307, 2042, 2614, 3063, 3921, 4084, 5105, 5228, 6126, 6535, 7842, 8168, 10210, 10456, 12252, 13070, 15315, 15684, 16336, 19605, 20420, 20912, 24504, 26140, 30630, 31368, 32672, 39210, 40840, 41824, 49008, 52280, 61260, 62736, 78420, 81680, 98016, 104560, 122520, 125472, 156840, 163360, 209120, 245040, 313680, 490080, 627360, 1334447, 2668894, 4003341, 5337788, 6672235, 8006682, 10675576, 13344470, 16013364, 20016705, 21351152, 26688940, 32026728, 40033410, 42702304, 53377880, 64053456, 80066820, 106755760, 128106912, 160133640, 213511520, 320267280, 640534560.
If you add them up, you will get the total of 2,021,205,312.