20139980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{20551}}^1$

素因数の和:20574

約数の個数: 36

約数和(自身を含む): 49201488

約数和(自身を除く): 29061508

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 20551, 41102, 82204, 102755, 143857, 205510, 287714, 411020, 575428, 719285, 1006999, 1438570, 2013998, 2877140, 4027996, 5034995, 10069990, 20139980]

約数ペア:

[(1, 20139980), (2, 10069990), (4, 5034995), (5, 4027996), (7, 2877140), (10, 2013998), (14, 1438570), (20, 1006999), (28, 719285), (35, 575428), (49, 411020), (70, 287714), (98, 205510), (140, 143857), (196, 102755), (245, 82204), (490, 41102), (980, 20551)]