19967120

素因数分解:

$2^4\times 5^1\times {\mathrm{249589}}^1$

素因数の和:249602

約数の個数: 20

約数和(自身を含む): 46423740

約数和(自身を除く): 26456620

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249589, 499178, 998356, 1247945, 1996712, 2495890, 3993424, 4991780, 9983560, 19967120]

約数ペア:

[(1, 19967120), (2, 9983560), (4, 4991780), (5, 3993424), (8, 2495890), (10, 1996712), (16, 1247945), (20, 998356), (40, 499178), (80, 249589)]