20987690

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{123457}}^1$

素因数の和:123481

約数の個数: 16

約数和(自身を含む): 40000392

約数和(自身を除く): 19012702

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 123457, 246914, 617285, 1234570, 2098769, 4197538, 10493845, 20987690]

約数ペア:

[(1, 20987690), (2, 10493845), (5, 4197538), (10, 2098769), (17, 1234570), (34, 617285), (85, 246914), (170, 123457)]