19871120

素因数分解:

$2^4\times 5^1\times {\mathrm{248389}}^1$

素因数の和:248402

約数の個数: 20

約数和(自身を含む): 46200540

約数和(自身を除く): 26329420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248389, 496778, 993556, 1241945, 1987112, 2483890, 3974224, 4967780, 9935560, 19871120]

約数ペア:

[(1, 19871120), (2, 9935560), (4, 4967780), (5, 3974224), (8, 2483890), (10, 1987112), (16, 1241945), (20, 993556), (40, 496778), (80, 248389)]