20981995

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{193}}^1\times {\mathrm{1279}}^1$

素因数の和:1494

約数の個数: 16

約数和(自身を含む): 26818560

約数和(自身を除く): 5836565

約数列:

[1, 5, 17, 85, 193, 965, 1279, 3281, 6395, 16405, 21743, 108715, 246847, 1234235, 4196399, 20981995]

約数ペア:

[(1, 20981995), (5, 4196399), (17, 1234235), (85, 246847), (193, 108715), (965, 21743), (1279, 16405), (3281, 6395)]