19881620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{90371}}^1$

素因数の和:90391

約数の個数: 24

約数和(自身を含む): 45547488

約数和(自身を除く): 25665868

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 90371, 180742, 361484, 451855, 903710, 994081, 1807420, 1988162, 3976324, 4970405, 9940810, 19881620]

約数ペア:

[(1, 19881620), (2, 9940810), (4, 4970405), (5, 3976324), (10, 1988162), (11, 1807420), (20, 994081), (22, 903710), (44, 451855), (55, 361484), (110, 180742), (220, 90371)]