The factors of the number 13,406,976 are: 1, 2, 3, 4, 6, 8, 9, 11, 12, 16, 18, 22, 23, 24, 32, 33, 36, 44, 46, 48, 64, 66, 69, 72, 88, 92, 96, 99, 128, 132, 138, 144, 176, 184, 192, 198, 207, 253, 256, 264, 276, 288, 352, 368, 384, 396, 414, 506, 528, 529, 552, 576, 704, 736, 759, 768, 792, 828, 1012, 1056, 1058, 1104, 1152, 1408, 1472, 1518, 1584, 1587, 1656, 2024, 2112, 2116, 2208, 2277, 2304, 2816, 2944, 3036, 3168, 3174, 3312, 4048, 4224, 4232, 4416, 4554, 4761, 5819, 5888, 6072, 6336, 6348, 6624, 8096, 8448, 8464, 8832, 9108, 9522, 11638, 12144, 12672, 12696, 13248, 16192, 16928, 17457, 17664, 18216, 19044, 23276, 24288, 25344, 25392, 26496, 32384, 33856, 34914, 36432, 38088, 46552, 48576, 50784, 52371, 52992, 64768, 67712, 69828, 72864, 76176, 93104, 97152, 101568, 104742, 135424, 139656, 145728, 152352, 186208, 194304, 203136, 209484, 279312, 291456, 304704, 372416, 406272, 418968, 558624, 582912, 609408, 744832, 837936, 1117248, 1218816, 1489664, 1675872, 2234496, 3351744, 4468992, 6703488, 13406976.
If you add them up, you will get the total of 44,082,948.