19997800

素因数分解:

$2^3\times 5^2\times {\mathrm{99989}}^1$

素因数の和:100005

約数の個数: 24

約数和(自身を含む): 46495350

約数和(自身を除く): 26497550

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 99989, 199978, 399956, 499945, 799912, 999890, 1999780, 2499725, 3999560, 4999450, 9998900, 19997800]

約数ペア:

[(1, 19997800), (2, 9998900), (4, 4999450), (5, 3999560), (8, 2499725), (10, 1999780), (20, 999890), (25, 799912), (40, 499945), (50, 399956), (100, 199978), (200, 99989)]