81400780

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{31069}}^1$

素因数の和:31209

約数の個数: 24

約数和(自身を含む): 172252080

約数和(自身を除く): 90851300

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 31069, 62138, 124276, 155345, 310690, 621380, 4070039, 8140078, 16280156, 20350195, 40700390, 81400780]

約数ペア:

[(1, 81400780), (2, 40700390), (4, 20350195), (5, 16280156), (10, 8140078), (20, 4070039), (131, 621380), (262, 310690), (524, 155345), (655, 124276), (1310, 62138), (2620, 31069)]