81721285

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1\times {\mathrm{2551}}^1$

素因数の和:2748

約数の個数: 16

約数和(自身を含む): 101059200

約数和(自身を除く): 19337915

約数列:

[1, 5, 43, 149, 215, 745, 2551, 6407, 12755, 32035, 109693, 380099, 548465, 1900495, 16344257, 81721285]

約数ペア:

[(1, 81721285), (5, 16344257), (43, 1900495), (149, 548465), (215, 380099), (745, 109693), (2551, 32035), (6407, 12755)]