21164720

素因数分解:

$2^4\times 5^1\times {\mathrm{264559}}^1$

素因数の和:264572

約数の個数: 20

約数和(自身を含む): 49208160

約数和(自身を除く): 28043440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264559, 529118, 1058236, 1322795, 2116472, 2645590, 4232944, 5291180, 10582360, 21164720]

約数ペア:

[(1, 21164720), (2, 10582360), (4, 5291180), (5, 4232944), (8, 2645590), (10, 2116472), (16, 1322795), (20, 1058236), (40, 529118), (80, 264559)]