21805217

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{2447}}^1$

素因数の和:2540

約数の個数: 16

約数和(自身を含む): 26634240

約数和(自身を除く): 4829023

約数列:

[1, 7, 19, 67, 133, 469, 1273, 2447, 8911, 17129, 46493, 163949, 325451, 1147643, 3115031, 21805217]

約数ペア:

[(1, 21805217), (7, 3115031), (19, 1147643), (67, 325451), (133, 163949), (469, 46493), (1273, 17129), (2447, 8911)]