21016405

素因数分解:

$5^1\times {\mathrm{107}}^1\times {\mathrm{163}}^1\times {\mathrm{241}}^1$

素因数の和:516

約数の個数: 16

約数和(自身を含む): 25717824

約数和(自身を除く): 4701419

約数列:

[1, 5, 107, 163, 241, 535, 815, 1205, 17441, 25787, 39283, 87205, 128935, 196415, 4203281, 21016405]

約数ペア:

[(1, 21016405), (5, 4203281), (107, 196415), (163, 128935), (241, 87205), (535, 39283), (815, 25787), (1205, 17441)]