20987967

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{241}}^1$

素因数の和:304

約数の個数: 64

約数和(自身を含む): 39029760

約数和(自身を除く): 18041793

約数列:

[1, 3, 7, 11, 13, 21, 29, 33, 39, 77, 87, 91, 143, 203, 231, 241, 273, 319, 377, 429, 609, 723, 957, 1001, 1131, 1687, 2233, 2639, 2651, 3003, 3133, 4147, 5061, 6699, 6989, 7917, 7953, 9399, 12441, 18557, 20967, 21931, 29029, 34463, 48923, 55671, 65793, 76879, 87087, 90857, 103389, 146769, 230637, 241241, 272571, 538153, 635999, 723723, 999427, 1614459, 1907997, 2998281, 6995989, 20987967]

約数ペア:

[(1, 20987967), (3, 6995989), (7, 2998281), (11, 1907997), (13, 1614459), (21, 999427), (29, 723723), (33, 635999), (39, 538153), (77, 272571), (87, 241241), (91, 230637), (143, 146769), (203, 103389), (231, 90857), (241, 87087), (273, 76879), (319, 65793), (377, 55671), (429, 48923), (609, 34463), (723, 29029), (957, 21931), (1001, 20967), (1131, 18557), (1687, 12441), (2233, 9399), (2639, 7953), (2651, 7917), (3003, 6989), (3133, 6699), (4147, 5061)]