19997680

素因数分解:

$2^4\times 5^1\times {\mathrm{249971}}^1$

素因数の和:249984

約数の個数: 20

約数和(自身を含む): 46494792

約数和(自身を除く): 26497112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249971, 499942, 999884, 1249855, 1999768, 2499710, 3999536, 4999420, 9998840, 19997680]

約数ペア:

[(1, 19997680), (2, 9998840), (4, 4999420), (5, 3999536), (8, 2499710), (10, 1999768), (16, 1249855), (20, 999884), (40, 499942), (80, 249971)]