21031880

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{1033}}^1$

素因数の和:1553

約数の個数: 32

約数和(自身を含む): 47460600

約数和(自身を除く): 26428720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 1033, 2036, 2066, 2545, 4072, 4132, 5090, 5165, 8264, 10180, 10330, 20360, 20660, 41320, 525797, 1051594, 2103188, 2628985, 4206376, 5257970, 10515940, 21031880]

約数ペア:

[(1, 21031880), (2, 10515940), (4, 5257970), (5, 4206376), (8, 2628985), (10, 2103188), (20, 1051594), (40, 525797), (509, 41320), (1018, 20660), (1033, 20360), (2036, 10330), (2066, 10180), (2545, 8264), (4072, 5165), (4132, 5090)]