21611440

素因数分解:

$2^4\times 5^1\times {\mathrm{270143}}^1$

素因数の和:270156

約数の個数: 20

約数和(自身を含む): 50246784

約数和(自身を除く): 28635344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270143, 540286, 1080572, 1350715, 2161144, 2701430, 4322288, 5402860, 10805720, 21611440]

約数ペア:

[(1, 21611440), (2, 10805720), (4, 5402860), (5, 4322288), (8, 2701430), (10, 2161144), (16, 1350715), (20, 1080572), (40, 540286), (80, 270143)]