21601960

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{1061}}^1$

素因数の和:1581

約数の個数: 32

約数和(自身を含む): 48745800

約数和(自身を除く): 27143840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 1061, 2036, 2122, 2545, 4072, 4244, 5090, 5305, 8488, 10180, 10610, 20360, 21220, 42440, 540049, 1080098, 2160196, 2700245, 4320392, 5400490, 10800980, 21601960]

約数ペア:

[(1, 21601960), (2, 10800980), (4, 5400490), (5, 4320392), (8, 2700245), (10, 2160196), (20, 1080098), (40, 540049), (509, 42440), (1018, 21220), (1061, 20360), (2036, 10610), (2122, 10180), (2545, 8488), (4072, 5305), (4244, 5090)]