21165490

素因数分解:

$2^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{5441}}^1$

素因数の和:5837

約数の個数: 16

約数和(自身を含む): 38202840

約数和(自身を除く): 17037350

約数列:

[1, 2, 5, 10, 389, 778, 1945, 3890, 5441, 10882, 27205, 54410, 2116549, 4233098, 10582745, 21165490]

約数ペア:

[(1, 21165490), (2, 10582745), (5, 4233098), (10, 2116549), (389, 54410), (778, 27205), (1945, 10882), (3890, 5441)]