21331280

素因数分解:

$2^4\times 5^1\times {\mathrm{266641}}^1$

素因数の和:266654

約数の個数: 20

約数和(自身を含む): 49595412

約数和(自身を除く): 28264132

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266641, 533282, 1066564, 1333205, 2133128, 2666410, 4266256, 5332820, 10665640, 21331280]

約数ペア:

[(1, 21331280), (2, 10665640), (4, 5332820), (5, 4266256), (8, 2666410), (10, 2133128), (16, 1333205), (20, 1066564), (40, 533282), (80, 266641)]