20121291

素因数分解:

$3^4\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1$

素因数の和:217

約数の個数: 40

約数和(自身を含む): 31624560

約数和(自身を除く): 11503269

約数列:

[1, 3, 9, 27, 43, 53, 81, 109, 129, 159, 327, 387, 477, 981, 1161, 1431, 2279, 2943, 3483, 4293, 4687, 5777, 6837, 8829, 14061, 17331, 20511, 42183, 51993, 61533, 126549, 155979, 184599, 248411, 379647, 467937, 745233, 2235699, 6707097, 20121291]

約数ペア:

[(1, 20121291), (3, 6707097), (9, 2235699), (27, 745233), (43, 467937), (53, 379647), (81, 248411), (109, 184599), (129, 155979), (159, 126549), (327, 61533), (387, 51993), (477, 42183), (981, 20511), (1161, 17331), (1431, 14061), (2279, 8829), (2943, 6837), (3483, 5777), (4293, 4687)]