The factors of the number 161,207,172 are: 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 19, 21, 27, 28, 29, 36, 38, 42, 43, 54, 57, 58, 63, 76, 81, 84, 86, 87, 108, 114, 116, 126, 129, 133, 162, 171, 172, 174, 189, 203, 228, 243, 252, 258, 261, 266, 301, 324, 342, 348, 378, 387, 399, 406, 486, 513, 516, 522, 532, 551, 567, 602, 609, 684, 756, 774, 783, 798, 812, 817, 903, 972, 1026, 1044, 1102, 1134, 1161, 1197, 1204, 1218, 1247, 1539, 1548, 1566, 1596, 1634, 1653, 1701, 1806, 1827, 2052, 2204, 2268, 2322, 2349, 2394, 2436, 2451, 2494, 2709, 3078, 3132, 3268, 3306, 3402, 3483, 3591, 3612, 3654, 3741, 3857, 4617, 4644, 4698, 4788, 4902, 4959, 4988, 5418, 5481, 5719, 6156, 6612, 6804, 6966, 7047, 7182, 7308, 7353, 7482, 7714, 8127, 8729, 9234, 9396, 9804, 9918, 10449, 10773, 10836, 10962, 11223, 11438, 11571, 13932, 14094, 14364, 14706, 14877, 14964, 15428, 16254, 16443, 17157, 17458, 18468, 19836, 20898, 21546, 21924, 22059, 22446, 22876, 23142, 23693, 24381, 26187, 28188, 29412, 29754, 32319, 32508, 32886, 33669, 34314, 34713, 34916, 41796, 43092, 44118, 44631, 44892, 46284, 47386, 48762, 49329, 51471, 52374, 59508, 64638, 65772, 66177, 67338, 68628, 69426, 71079, 73143, 78561, 88236, 89262, 94772, 97524, 98658, 101007, 102942, 104139, 104748, 129276, 132354, 133893, 134676, 138852, 142158, 146286, 154413, 157122, 165851, 178524, 197316, 198531, 202014, 205884, 208278, 213237, 235683, 264708, 267786, 284316, 292572, 303021, 308826, 312417, 314244, 331702, 397062, 404028, 416556, 426474, 463239, 471366, 497553, 535572, 606042, 617652, 624834, 639711, 663404, 707049, 794124, 852948, 926478, 937251, 942732, 995106, 1212084, 1249668, 1279422, 1389717, 1414098, 1492659, 1852956, 1874502, 1919133, 1990212, 2121147, 2558844, 2779434, 2828196, 2985318, 3749004, 3838266, 4242294, 4477977, 5558868, 5757399, 5970636, 7676532, 8484588, 8955954, 11514798, 13433931, 17911908, 23029596, 26867862, 40301793, 53735724, 80603586, 161207172.
If you add them up, you will get the total of 538,137,600.