19998560

素因数分解:

$2^5\times 5^1\times {\mathrm{124991}}^1$

素因数の和:125006

約数の個数: 24

約数和(自身を含む): 47246976

約数和(自身を除く): 27248416

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 124991, 249982, 499964, 624955, 999928, 1249910, 1999856, 2499820, 3999712, 4999640, 9999280, 19998560]

約数ペア:

[(1, 19998560), (2, 9999280), (4, 4999640), (5, 3999712), (8, 2499820), (10, 1999856), (16, 1249910), (20, 999928), (32, 624955), (40, 499964), (80, 249982), (160, 124991)]