The factors of the number 7,422,144 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 29, 31, 32, 43, 48, 58, 62, 64, 86, 87, 93, 96, 116, 124, 129, 172, 174, 186, 192, 232, 248, 258, 344, 348, 372, 464, 496, 516, 688, 696, 744, 899, 928, 992, 1032, 1247, 1333, 1376, 1392, 1488, 1798, 1856, 1984, 2064, 2494, 2666, 2697, 2752, 2784, 2976, 3596, 3741, 3999, 4128, 4988, 5332, 5394, 5568, 5952, 7192, 7482, 7998, 8256, 9976, 10664, 10788, 14384, 14964, 15996, 19952, 21328, 21576, 28768, 29928, 31992, 38657, 39904, 42656, 43152, 57536, 59856, 63984, 77314, 79808, 85312, 86304, 115971, 119712, 127968, 154628, 172608, 231942, 239424, 255936, 309256, 463884, 618512, 927768, 1237024, 1855536, 2474048, 3711072, 7422144.
If you add them up, you will get the total of 21,457,920.