21211820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{1471}}^1$

素因数の和:1590

約数の個数: 48

約数和(自身を含む): 51437568

約数和(自身を除く): 30225748

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 103, 140, 206, 412, 515, 721, 1030, 1442, 1471, 2060, 2884, 2942, 3605, 5884, 7210, 7355, 10297, 14420, 14710, 20594, 29420, 41188, 51485, 102970, 151513, 205940, 303026, 606052, 757565, 1060591, 1515130, 2121182, 3030260, 4242364, 5302955, 10605910, 21211820]

約数ペア:

[(1, 21211820), (2, 10605910), (4, 5302955), (5, 4242364), (7, 3030260), (10, 2121182), (14, 1515130), (20, 1060591), (28, 757565), (35, 606052), (70, 303026), (103, 205940), (140, 151513), (206, 102970), (412, 51485), (515, 41188), (721, 29420), (1030, 20594), (1442, 14710), (1471, 14420), (2060, 10297), (2884, 7355), (2942, 7210), (3605, 5884)]