19901920

素因数分解:

$2^5\times 5^1\times {\mathrm{173}}^1\times {\mathrm{719}}^1$

素因数の和:907

約数の個数: 48

約数和(自身を含む): 47355840

約数和(自身を除く): 27453920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 173, 346, 692, 719, 865, 1384, 1438, 1730, 2768, 2876, 3460, 3595, 5536, 5752, 6920, 7190, 11504, 13840, 14380, 23008, 27680, 28760, 57520, 115040, 124387, 248774, 497548, 621935, 995096, 1243870, 1990192, 2487740, 3980384, 4975480, 9950960, 19901920]

約数ペア:

[(1, 19901920), (2, 9950960), (4, 4975480), (5, 3980384), (8, 2487740), (10, 1990192), (16, 1243870), (20, 995096), (32, 621935), (40, 497548), (80, 248774), (160, 124387), (173, 115040), (346, 57520), (692, 28760), (719, 27680), (865, 23008), (1384, 14380), (1438, 13840), (1730, 11504), (2768, 7190), (2876, 6920), (3460, 5752), (3595, 5536)]