21505731

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{163}}^1\times {\mathrm{199}}^1$

素因数の和:395

約数の個数: 32

約数和(自身を含む): 33062400

約数和(自身を除く): 11556669

約数列:

[1, 3, 13, 17, 39, 51, 163, 199, 221, 489, 597, 663, 2119, 2587, 2771, 3383, 6357, 7761, 8313, 10149, 32437, 36023, 43979, 97311, 108069, 131937, 421681, 551429, 1265043, 1654287, 7168577, 21505731]

約数ペア:

[(1, 21505731), (3, 7168577), (13, 1654287), (17, 1265043), (39, 551429), (51, 421681), (163, 131937), (199, 108069), (221, 97311), (489, 43979), (597, 36023), (663, 32437), (2119, 10149), (2587, 8313), (2771, 7761), (3383, 6357)]