21267820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{73}}^1\times {\mathrm{2081}}^1$

素因数の和:2170

約数の個数: 48

約数和(自身を含む): 51766848

約数和(自身を除く): 30499028

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 73, 140, 146, 292, 365, 511, 730, 1022, 1460, 2044, 2081, 2555, 4162, 5110, 8324, 10220, 10405, 14567, 20810, 29134, 41620, 58268, 72835, 145670, 151913, 291340, 303826, 607652, 759565, 1063391, 1519130, 2126782, 3038260, 4253564, 5316955, 10633910, 21267820]

約数ペア:

[(1, 21267820), (2, 10633910), (4, 5316955), (5, 4253564), (7, 3038260), (10, 2126782), (14, 1519130), (20, 1063391), (28, 759565), (35, 607652), (70, 303826), (73, 291340), (140, 151913), (146, 145670), (292, 72835), (365, 58268), (511, 41620), (730, 29134), (1022, 20810), (1460, 14567), (2044, 10405), (2081, 10220), (2555, 8324), (4162, 5110)]