20991430

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{123479}}^1$

素因数の和:123503

約数の個数: 16

約数和(自身を含む): 40007520

約数和(自身を除く): 19016090

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 123479, 246958, 617395, 1234790, 2099143, 4198286, 10495715, 20991430]

約数ペア:

[(1, 20991430), (2, 10495715), (5, 4198286), (10, 2099143), (17, 1234790), (34, 617395), (85, 246958), (170, 123479)]