18240397

素因数分解:

$7^4\times {\mathrm{71}}^1\times {\mathrm{107}}^1$

素因数の和:206

約数の個数: 20

約数和(自身を含む): 21780576

約数和(自身を除く): 3540179

約数列:

[1, 7, 49, 71, 107, 343, 497, 749, 2401, 3479, 5243, 7597, 24353, 36701, 53179, 170471, 256907, 372253, 2605771, 18240397]

約数ペア:

[(1, 18240397), (7, 2605771), (49, 372253), (71, 256907), (107, 170471), (343, 53179), (497, 36701), (749, 24353), (2401, 7597), (3479, 5243)]