21997591

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{12421}}^1$

素因数の和:12462

約数の個数: 16

約数和(自身を含む): 28620288

約数和(自身を除く): 6622697

約数列:

[1, 7, 11, 23, 77, 161, 253, 1771, 12421, 86947, 136631, 285683, 956417, 1999781, 3142513, 21997591]

約数ペア:

[(1, 21997591), (7, 3142513), (11, 1999781), (23, 956417), (77, 285683), (161, 136631), (253, 86947), (1771, 12421)]