21390370

素因数分解:

$2^1\times 5^1\times {\mathrm{107}}^1\times {\mathrm{19991}}^1$

素因数の和:20105

約数の個数: 16

約数和(自身を含む): 38864448

約数和(自身を除く): 17474078

約数列:

[1, 2, 5, 10, 107, 214, 535, 1070, 19991, 39982, 99955, 199910, 2139037, 4278074, 10695185, 21390370]

約数ペア:

[(1, 21390370), (2, 10695185), (5, 4278074), (10, 2139037), (107, 199910), (214, 99955), (535, 39982), (1070, 19991)]