20821520

素因数分解:

$2^4\times 5^1\times {\mathrm{260269}}^1$

素因数の和:260282

約数の個数: 20

約数和(自身を含む): 48410220

約数和(自身を除く): 27588700

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 260269, 520538, 1041076, 1301345, 2082152, 2602690, 4164304, 5205380, 10410760, 20821520]

約数ペア:

[(1, 20821520), (2, 10410760), (4, 5205380), (5, 4164304), (8, 2602690), (10, 2082152), (16, 1301345), (20, 1041076), (40, 520538), (80, 260269)]