21889881

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{229}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 36836800

約数和(自身を除く): 14946919

約数列:

[1, 3, 9, 13, 19, 39, 43, 57, 117, 129, 171, 229, 247, 387, 559, 687, 741, 817, 1677, 2061, 2223, 2451, 2977, 4351, 5031, 7353, 8931, 9847, 10621, 13053, 26793, 29541, 31863, 39159, 56563, 88623, 95589, 128011, 169689, 187093, 384033, 509067, 561279, 1152099, 1683837, 2432209, 7296627, 21889881]

約数ペア:

[(1, 21889881), (3, 7296627), (9, 2432209), (13, 1683837), (19, 1152099), (39, 561279), (43, 509067), (57, 384033), (117, 187093), (129, 169689), (171, 128011), (229, 95589), (247, 88623), (387, 56563), (559, 39159), (687, 31863), (741, 29541), (817, 26793), (1677, 13053), (2061, 10621), (2223, 9847), (2451, 8931), (2977, 7353), (4351, 5031)]