28811920

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{2591}}^1$

素因数の和:2743

約数の個数: 40

約数和(自身を含む): 67495680

約数和(自身を除く): 38683760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 2224, 2591, 2780, 5182, 5560, 10364, 11120, 12955, 20728, 25910, 41456, 51820, 103640, 207280, 360149, 720298, 1440596, 1800745, 2881192, 3601490, 5762384, 7202980, 14405960, 28811920]

約数ペア:

[(1, 28811920), (2, 14405960), (4, 7202980), (5, 5762384), (8, 3601490), (10, 2881192), (16, 1800745), (20, 1440596), (40, 720298), (80, 360149), (139, 207280), (278, 103640), (556, 51820), (695, 41456), (1112, 25910), (1390, 20728), (2224, 12955), (2591, 11120), (2780, 10364), (5182, 5560)]