19977680

素因数分解:

$2^4\times 5^1\times {\mathrm{249721}}^1$

素因数の和:249734

約数の個数: 20

約数和(自身を含む): 46448292

約数和(自身を除く): 26470612

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249721, 499442, 998884, 1248605, 1997768, 2497210, 3995536, 4994420, 9988840, 19977680]

約数ペア:

[(1, 19977680), (2, 9988840), (4, 4994420), (5, 3995536), (8, 2497210), (10, 1997768), (16, 1248605), (20, 998884), (40, 499442), (80, 249721)]