21256720

素因数分解:

$2^4\times 5^1\times {\mathrm{265709}}^1$

素因数の和:265722

約数の個数: 20

約数和(自身を含む): 49422060

約数和(自身を除く): 28165340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265709, 531418, 1062836, 1328545, 2125672, 2657090, 4251344, 5314180, 10628360, 21256720]

約数ペア:

[(1, 21256720), (2, 10628360), (4, 5314180), (5, 4251344), (8, 2657090), (10, 2125672), (16, 1328545), (20, 1062836), (40, 531418), (80, 265709)]