19965040

素因数分解:

$2^4\times 5^1\times {\mathrm{249563}}^1$

素因数の和:249576

約数の個数: 20

約数和(自身を含む): 46418904

約数和(自身を除く): 26453864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249563, 499126, 998252, 1247815, 1996504, 2495630, 3993008, 4991260, 9982520, 19965040]

約数ペア:

[(1, 19965040), (2, 9982520), (4, 4991260), (5, 3993008), (8, 2495630), (10, 1996504), (16, 1247815), (20, 998252), (40, 499126), (80, 249563)]