21145840

素因数分解:

$2^4\times 5^1\times {\mathrm{264323}}^1$

素因数の和:264336

約数の個数: 20

約数和(自身を含む): 49164264

約数和(自身を除く): 28018424

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264323, 528646, 1057292, 1321615, 2114584, 2643230, 4229168, 5286460, 10572920, 21145840]

約数ペア:

[(1, 21145840), (2, 10572920), (4, 5286460), (5, 4229168), (8, 2643230), (10, 2114584), (16, 1321615), (20, 1057292), (40, 528646), (80, 264323)]