21571251

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{677}}^1$

素因数の和:755

約数の個数: 32

約数和(自身を含む): 33411840

約数和(自身を除く): 11840589

約数列:

[1, 3, 13, 19, 39, 43, 57, 129, 247, 559, 677, 741, 817, 1677, 2031, 2451, 8801, 10621, 12863, 26403, 29111, 31863, 38589, 87333, 167219, 378443, 501657, 553109, 1135329, 1659327, 7190417, 21571251]

約数ペア:

[(1, 21571251), (3, 7190417), (13, 1659327), (19, 1135329), (39, 553109), (43, 501657), (57, 378443), (129, 167219), (247, 87333), (559, 38589), (677, 31863), (741, 29111), (817, 26403), (1677, 12863), (2031, 10621), (2451, 8801)]