81353620

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{31051}}^1$

素因数の和:31191

約数の個数: 24

約数和(自身を含む): 172152288

約数和(自身を除く): 90798668

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 31051, 62102, 124204, 155255, 310510, 621020, 4067681, 8135362, 16270724, 20338405, 40676810, 81353620]

約数ペア:

[(1, 81353620), (2, 40676810), (4, 20338405), (5, 16270724), (10, 8135362), (20, 4067681), (131, 621020), (262, 310510), (524, 155255), (655, 124204), (1310, 62102), (2620, 31051)]