999999

素因数分解:

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

素因数の和:77

約数の個数: 64

約数和(自身を含む): 2042880

約数和(自身を除く): 1042881

約数列:

[1, 3, 7, 9, 11, 13, 21, 27, 33, 37, 39, 63, 77, 91, 99, 111, 117, 143, 189, 231, 259, 273, 297, 333, 351, 407, 429, 481, 693, 777, 819, 999, 1001, 1221, 1287, 1443, 2079, 2331, 2457, 2849, 3003, 3367, 3663, 3861, 4329, 5291, 6993, 8547, 9009, 10101, 10989, 12987, 15873, 25641, 27027, 30303, 37037, 47619, 76923, 90909, 111111, 142857, 333333, 999999]

約数ペア:

[(1, 999999), (3, 333333), (7, 142857), (9, 111111), (11, 90909), (13, 76923), (21, 47619), (27, 37037), (33, 30303), (37, 27027), (39, 25641), (63, 15873), (77, 12987), (91, 10989), (99, 10101), (111, 9009), (117, 8547), (143, 6993), (189, 5291), (231, 4329), (259, 3861), (273, 3663), (297, 3367), (333, 3003), (351, 2849), (407, 2457), (429, 2331), (481, 2079), (693, 1443), (777, 1287), (819, 1221), (999, 1001)]