20718509

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{307}}^1\times {\mathrm{311}}^1$

素因数の和:656

約数の個数: 16

約数和(自身を含む): 24600576

約数和(自身を除く): 3882067

約数列:

[1, 7, 31, 217, 307, 311, 2149, 2177, 9517, 9641, 66619, 67487, 95477, 668339, 2959787, 20718509]

約数ペア:

[(1, 20718509), (7, 2959787), (31, 668339), (217, 95477), (307, 67487), (311, 66619), (2149, 9641), (2177, 9517)]