The factors of the number 420,420 are: 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 20, 21, 22, 26, 28, 30, 33, 35, 39, 42, 44, 49, 52, 55, 60, 65, 66, 70, 77, 78, 84, 91, 98, 105, 110, 130, 132, 140, 143, 147, 154, 156, 165, 182, 195, 196, 210, 220, 231, 245, 260, 273, 286, 294, 308, 330, 364, 385, 390, 420, 429, 455, 462, 490, 539, 546, 572, 588, 637, 660, 715, 735, 770, 780, 858, 910, 924, 980, 1001, 1078, 1092, 1155, 1274, 1365, 1430, 1470, 1540, 1617, 1716, 1820, 1911, 2002, 2145, 2156, 2310, 2548, 2695, 2730, 2860, 2940, 3003, 3185, 3234, 3822, 4004, 4290, 4620, 5005, 5390, 5460, 6006, 6370, 6468, 7007, 7644, 8085, 8580, 9555, 10010, 10780, 12012, 12740, 14014, 15015, 16170, 19110, 20020, 21021, 28028, 30030, 32340, 35035, 38220, 42042, 60060, 70070, 84084, 105105, 140140, 210210, 420420.
If you add them up, you will get the total of 420,421. Now subtract 420,420 to get 1,188,348