1999998

素因数分解:

$2^1\times 3^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1$

素因数の和:79

約数の個数: 128

約数和(自身を含む): 6128640

約数和(自身を除く): 4128642

約数列:

[1, 2, 3, 6, 7, 9, 11, 13, 14, 18, 21, 22, 26, 27, 33, 37, 39, 42, 54, 63, 66, 74, 77, 78, 91, 99, 111, 117, 126, 143, 154, 182, 189, 198, 222, 231, 234, 259, 273, 286, 297, 333, 351, 378, 407, 429, 462, 481, 518, 546, 594, 666, 693, 702, 777, 814, 819, 858, 962, 999, 1001, 1221, 1287, 1386, 1443, 1554, 1638, 1998, 2002, 2079, 2331, 2442, 2457, 2574, 2849, 2886, 3003, 3367, 3663, 3861, 4158, 4329, 4662, 4914, 5291, 5698, 6006, 6734, 6993, 7326, 7722, 8547, 8658, 9009, 10101, 10582, 10989, 12987, 13986, 15873, 17094, 18018, 20202, 21978, 25641, 25974, 27027, 30303, 31746, 37037, 47619, 51282, 54054, 60606, 74074, 76923, 90909, 95238, 111111, 142857, 153846, 181818, 222222, 285714, 333333, 666666, 999999, 1999998]

約数ペア:

[(1, 1999998), (2, 999999), (3, 666666), (6, 333333), (7, 285714), (9, 222222), (11, 181818), (13, 153846), (14, 142857), (18, 111111), (21, 95238), (22, 90909), (26, 76923), (27, 74074), (33, 60606), (37, 54054), (39, 51282), (42, 47619), (54, 37037), (63, 31746), (66, 30303), (74, 27027), (77, 25974), (78, 25641), (91, 21978), (99, 20202), (111, 18018), (117, 17094), (126, 15873), (143, 13986), (154, 12987), (182, 10989), (189, 10582), (198, 10101), (222, 9009), (231, 8658), (234, 8547), (259, 7722), (273, 7326), (286, 6993), (297, 6734), (333, 6006), (351, 5698), (378, 5291), (407, 4914), (429, 4662), (462, 4329), (481, 4158), (518, 3861), (546, 3663), (594, 3367), (666, 3003), (693, 2886), (702, 2849), (777, 2574), (814, 2457), (819, 2442), (858, 2331), (962, 2079), (999, 2002), (1001, 1998), (1221, 1638), (1287, 1554), (1386, 1443)]