21720831

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{53}}^1\times {\mathrm{1129}}^1$

素因数の和:1207

約数の個数: 24

約数和(自身を含む): 32462640

約数和(自身を除く): 10741809

約数列:

[1, 3, 11, 33, 53, 121, 159, 363, 583, 1129, 1749, 3387, 6413, 12419, 19239, 37257, 59837, 136609, 179511, 409827, 658207, 1974621, 7240277, 21720831]

約数ペア:

[(1, 21720831), (3, 7240277), (11, 1974621), (33, 658207), (53, 409827), (121, 179511), (159, 136609), (363, 59837), (583, 37257), (1129, 19239), (1749, 12419), (3387, 6413)]