400780

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{691}}^1$

素因数の和:729

約数の個数: 24

約数和(自身を含む): 871920

約数和(自身を除く): 471140

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 691, 1382, 2764, 3455, 6910, 13820, 20039, 40078, 80156, 100195, 200390, 400780]

約数ペア:

[(1, 400780), (2, 200390), (4, 100195), (5, 80156), (10, 40078), (20, 20039), (29, 13820), (58, 6910), (116, 3455), (145, 2764), (290, 1382), (580, 691)]