19886980

素因数分解:

$2^2\times 5^1\times {\mathrm{691}}^1\times {\mathrm{1439}}^1$

素因数の和:2139

約数の個数: 24

約数和(自身を含む): 41852160

約数和(自身を除く): 21965180

約数列:

[1, 2, 4, 5, 10, 20, 691, 1382, 1439, 2764, 2878, 3455, 5756, 6910, 7195, 13820, 14390, 28780, 994349, 1988698, 3977396, 4971745, 9943490, 19886980]

約数ペア:

[(1, 19886980), (2, 9943490), (4, 4971745), (5, 3977396), (10, 1988698), (20, 994349), (691, 28780), (1382, 14390), (1439, 13820), (2764, 7195), (2878, 6910), (3455, 5756)]