21781890529

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{401}}^1\times {\mathrm{408413}}^1$

素因数の和:408840

約数の個数: 16

約数和(自身を含む): 26269188480

約数和(自身を除く): 4487297951

約数列:

[1, 7, 19, 133, 401, 2807, 7619, 53333, 408413, 2858891, 7759847, 54318929, 163773613, 1146415291, 3111698647, 21781890529]

約数ペア:

[(1, 21781890529), (7, 3111698647), (19, 1146415291), (133, 163773613), (401, 54318929), (2807, 7759847), (7619, 2858891), (53333, 408413)]