81656140

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{94949}}^1$

素因数の和:95001

約数の個数: 24

約数和(自身を含む): 175467600

約数和(自身を除く): 93811460

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 94949, 189898, 379796, 474745, 949490, 1898980, 4082807, 8165614, 16331228, 20414035, 40828070, 81656140]

約数ペア:

[(1, 81656140), (2, 40828070), (4, 20414035), (5, 16331228), (10, 8165614), (20, 4082807), (43, 1898980), (86, 949490), (172, 474745), (215, 379796), (430, 189898), (860, 94949)]