19981040

素因数分解:

$2^4\times 5^1\times {\mathrm{249763}}^1$

素因数の和:249776

約数の個数: 20

約数和(自身を含む): 46456104

約数和(自身を除く): 26475064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249763, 499526, 999052, 1248815, 1998104, 2497630, 3996208, 4995260, 9990520, 19981040]

約数ペア:

[(1, 19981040), (2, 9990520), (4, 4995260), (5, 3996208), (8, 2497630), (10, 1998104), (16, 1248815), (20, 999052), (40, 499526), (80, 249763)]