19909520

素因数分解:

$2^4\times 5^1\times {\mathrm{248869}}^1$

素因数の和:248882

約数の個数: 20

約数和(自身を含む): 46289820

約数和(自身を除く): 26380300

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248869, 497738, 995476, 1244345, 1990952, 2488690, 3981904, 4977380, 9954760, 19909520]

約数ペア:

[(1, 19909520), (2, 9954760), (4, 4977380), (5, 3981904), (8, 2488690), (10, 1990952), (16, 1244345), (20, 995476), (40, 497738), (80, 248869)]