The factors of the number 1,606,320 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 23, 24, 30, 36, 40, 45, 46, 48, 60, 69, 72, 80, 90, 92, 97, 115, 120, 138, 144, 180, 184, 194, 207, 230, 240, 276, 291, 345, 360, 368, 388, 414, 460, 485, 552, 582, 690, 720, 776, 828, 873, 920, 970, 1035, 1104, 1164, 1380, 1455, 1552, 1656, 1746, 1840, 1940, 2070, 2231, 2328, 2760, 2910, 3312, 3492, 3880, 4140, 4365, 4462, 4656, 5520, 5820, 6693, 6984, 7760, 8280, 8730, 8924, 11155, 11640, 13386, 13968, 16560, 17460, 17848, 20079, 22310, 23280, 26772, 33465, 34920, 35696, 40158, 44620, 53544, 66930, 69840, 80316, 89240, 100395, 107088, 133860, 160632, 178480, 200790, 267720, 321264, 401580, 535440, 803160, 1606320.
If you add them up, you will get the total of 5,687,136.