21271280

素因数分解:

$2^4\times 5^1\times {\mathrm{265891}}^1$

素因数の和:265904

約数の個数: 20

約数和(自身を含む): 49455912

約数和(自身を除く): 28184632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265891, 531782, 1063564, 1329455, 2127128, 2658910, 4254256, 5317820, 10635640, 21271280]

約数ペア:

[(1, 21271280), (2, 10635640), (4, 5317820), (5, 4254256), (8, 2658910), (10, 2127128), (16, 1329455), (20, 1063564), (40, 531782), (80, 265891)]