21988880

素因数分解:

$2^4\times 5^1\times {\mathrm{274861}}^1$

素因数の和:274874

約数の個数: 20

約数和(自身を含む): 51124332

約数和(自身を除く): 29135452

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 274861, 549722, 1099444, 1374305, 2198888, 2748610, 4397776, 5497220, 10994440, 21988880]

約数ペア:

[(1, 21988880), (2, 10994440), (4, 5497220), (5, 4397776), (8, 2748610), (10, 2198888), (16, 1374305), (20, 1099444), (40, 549722), (80, 274861)]