21081395

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{3163}}^1$

素因数の和:3242

約数の個数: 16

約数和(自身を含む): 26729472

約数和(自身を除く): 5648077

約数列:

[1, 5, 31, 43, 155, 215, 1333, 3163, 6665, 15815, 98053, 136009, 490265, 680045, 4216279, 21081395]

約数ペア:

[(1, 21081395), (5, 4216279), (31, 680045), (43, 490265), (155, 136009), (215, 98053), (1333, 15815), (3163, 6665)]