21255160

素因数分解:

$2^3\times 5^1\times {\mathrm{691}}^1\times {\mathrm{769}}^1$

素因数の和:1471

約数の個数: 32

約数和(自身を含む): 47955600

約数和(自身を除く): 26700440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 691, 769, 1382, 1538, 2764, 3076, 3455, 3845, 5528, 6152, 6910, 7690, 13820, 15380, 27640, 30760, 531379, 1062758, 2125516, 2656895, 4251032, 5313790, 10627580, 21255160]

約数ペア:

[(1, 21255160), (2, 10627580), (4, 5313790), (5, 4251032), (8, 2656895), (10, 2125516), (20, 1062758), (40, 531379), (691, 30760), (769, 27640), (1382, 15380), (1538, 13820), (2764, 7690), (3076, 6910), (3455, 6152), (3845, 5528)]