21258320

素因数分解:

$2^4\times 5^1\times {\mathrm{265729}}^1$

素因数の和:265742

約数の個数: 20

約数和(自身を含む): 49425780

約数和(自身を除く): 28167460

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265729, 531458, 1062916, 1328645, 2125832, 2657290, 4251664, 5314580, 10629160, 21258320]

約数ペア:

[(1, 21258320), (2, 10629160), (4, 5314580), (5, 4251664), (8, 2657290), (10, 2125832), (16, 1328645), (20, 1062916), (40, 531458), (80, 265729)]