21820565

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{211}}^1$

素因数の和:309

約数の個数: 32

約数和(自身を含む): 29774976

約数和(自身を除く): 7954411

約数列:

[1, 5, 13, 37, 43, 65, 185, 211, 215, 481, 559, 1055, 1591, 2405, 2743, 2795, 7807, 7955, 9073, 13715, 20683, 39035, 45365, 101491, 103415, 117949, 335701, 507455, 589745, 1678505, 4364113, 21820565]

約数ペア:

[(1, 21820565), (5, 4364113), (13, 1678505), (37, 589745), (43, 507455), (65, 335701), (185, 117949), (211, 103415), (215, 101491), (481, 45365), (559, 39035), (1055, 20683), (1591, 13715), (2405, 9073), (2743, 7955), (2795, 7807)]