20405680

素因数分解:

$2^4\times 5^1\times {\mathrm{255071}}^1$

素因数の和:255084

約数の個数: 20

約数和(自身を含む): 47443392

約数和(自身を除く): 27037712

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 255071, 510142, 1020284, 1275355, 2040568, 2550710, 4081136, 5101420, 10202840, 20405680]

約数ペア:

[(1, 20405680), (2, 10202840), (4, 5101420), (5, 4081136), (8, 2550710), (10, 2040568), (16, 1275355), (20, 1020284), (40, 510142), (80, 255071)]