19988717

素因数分解:

$7^2\times {\mathrm{503}}^1\times {\mathrm{811}}^1$

素因数の和:1328

約数の個数: 12

約数和(自身を含む): 23327136

約数和(自身を除く): 3338419

約数列:

[1, 7, 49, 503, 811, 3521, 5677, 24647, 39739, 407933, 2855531, 19988717]

約数ペア:

[(1, 19988717), (7, 2855531), (49, 407933), (503, 39739), (811, 24647), (3521, 5677)]