19911280

素因数分解:

$2^4\times 5^1\times {\mathrm{248891}}^1$

素因数の和:248904

約数の個数: 20

約数和(自身を含む): 46293912

約数和(自身を除く): 26382632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248891, 497782, 995564, 1244455, 1991128, 2488910, 3982256, 4977820, 9955640, 19911280]

約数ペア:

[(1, 19911280), (2, 9955640), (4, 4977820), (5, 3982256), (8, 2488910), (10, 1991128), (16, 1244455), (20, 995564), (40, 497782), (80, 248891)]