99999920

素因数分解:

$2^4\times 5^1\times {\mathrm{1249999}}^1$

素因数の和:1250012

約数の個数: 20

約数和(自身を含む): 232500000

約数和(自身を除く): 132500080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1249999, 2499998, 4999996, 6249995, 9999992, 12499990, 19999984, 24999980, 49999960, 99999920]

約数ペア:

[(1, 99999920), (2, 49999960), (4, 24999980), (5, 19999984), (8, 12499990), (10, 9999992), (16, 6249995), (20, 4999996), (40, 2499998), (80, 1249999)]