21080785

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20173}}^1$

素因数の和:20208

約数の個数: 16

約数和(自身を含む): 29050560

約数和(自身を除く): 7969775

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20173, 100865, 221903, 383287, 1109515, 1916435, 4216157, 21080785]

約数ペア:

[(1, 21080785), (5, 4216157), (11, 1916435), (19, 1109515), (55, 383287), (95, 221903), (209, 100865), (1045, 20173)]