20778580

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13151}}^1$

素因数の和:13239

約数の個数: 24

約数和(自身を含む): 44190720

約数和(自身を除く): 23412140

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13151, 26302, 52604, 65755, 131510, 263020, 1038929, 2077858, 4155716, 5194645, 10389290, 20778580]

約数ペア:

[(1, 20778580), (2, 10389290), (4, 5194645), (5, 4155716), (10, 2077858), (20, 1038929), (79, 263020), (158, 131510), (316, 65755), (395, 52604), (790, 26302), (1580, 13151)]