21240880

素因数分解:

$2^4\times 5^1\times {\mathrm{265511}}^1$

素因数の和:265524

約数の個数: 20

約数和(自身を含む): 49385232

約数和(自身を除く): 28144352

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265511, 531022, 1062044, 1327555, 2124088, 2655110, 4248176, 5310220, 10620440, 21240880]

約数ペア:

[(1, 21240880), (2, 10620440), (4, 5310220), (5, 4248176), (8, 2655110), (10, 2124088), (16, 1327555), (20, 1062044), (40, 531022), (80, 265511)]