818181

素因数分解:

$3^5\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1$

素因数の和:72

約数の個数: 48

約数和(自身を含む): 1549184

約数和(自身を除く): 731003

約数列:

[1, 3, 7, 9, 13, 21, 27, 37, 39, 63, 81, 91, 111, 117, 189, 243, 259, 273, 333, 351, 481, 567, 777, 819, 999, 1053, 1443, 1701, 2331, 2457, 2997, 3159, 3367, 4329, 6993, 7371, 8991, 10101, 12987, 20979, 22113, 30303, 38961, 62937, 90909, 116883, 272727, 818181]

約数ペア:

[(1, 818181), (3, 272727), (7, 116883), (9, 90909), (13, 62937), (21, 38961), (27, 30303), (37, 22113), (39, 20979), (63, 12987), (81, 10101), (91, 8991), (111, 7371), (117, 6993), (189, 4329), (243, 3367), (259, 3159), (273, 2997), (333, 2457), (351, 2331), (481, 1701), (567, 1443), (777, 1053), (819, 999)]