The factors of the number 12,144,420 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 30, 36, 38, 45, 53, 57, 60, 67, 76, 90, 95, 106, 114, 134, 159, 171, 180, 190, 201, 212, 228, 265, 268, 285, 318, 335, 342, 380, 402, 477, 530, 570, 603, 636, 670, 684, 795, 804, 855, 954, 1005, 1007, 1060, 1140, 1206, 1273, 1340, 1590, 1710, 1908, 2010, 2014, 2385, 2412, 2546, 3015, 3021, 3180, 3420, 3551, 3819, 4020, 4028, 4770, 5035, 5092, 6030, 6042, 6365, 7102, 7638, 9063, 9540, 10070, 10653, 11457, 12060, 12084, 12730, 14204, 15105, 15276, 17755, 18126, 19095, 20140, 21306, 22914, 25460, 30210, 31959, 35510, 36252, 38190, 42612, 45315, 45828, 53265, 57285, 60420, 63918, 67469, 71020, 76380, 90630, 106530, 114570, 127836, 134938, 159795, 181260, 202407, 213060, 229140, 269876, 319590, 337345, 404814, 607221, 639180, 674690, 809628, 1012035, 1214442, 1349380, 2024070, 2428884, 3036105, 4048140, 6072210, 12144420.
If you add them up, you will get the total of 40,098,240.