20721665

素因数分解:

$5^1\times {\mathrm{37}}^1\times {\mathrm{101}}^1\times {\mathrm{1109}}^1$

素因数の和:1252

約数の個数: 16

約数和(自身を含む): 25814160

約数和(自身を除く): 5092495

約数列:

[1, 5, 37, 101, 185, 505, 1109, 3737, 5545, 18685, 41033, 112009, 205165, 560045, 4144333, 20721665]

約数ペア:

[(1, 20721665), (5, 4144333), (37, 560045), (101, 205165), (185, 112009), (505, 41033), (1109, 18685), (3737, 5545)]