21306505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20389}}^1$

素因数の和:20424

約数の個数: 16

約数和(自身を含む): 29361600

約数和(自身を除く): 8055095

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20389, 101945, 224279, 387391, 1121395, 1936955, 4261301, 21306505]

約数ペア:

[(1, 21306505), (5, 4261301), (11, 1936955), (19, 1121395), (55, 387391), (95, 224279), (209, 101945), (1045, 20389)]