81168920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{289889}}^1$

素因数の和:289907

約数の個数: 32

約数和(自身を含む): 208720800

約数和(自身を除く): 127551880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 289889, 579778, 1159556, 1449445, 2029223, 2319112, 2898890, 4058446, 5797780, 8116892, 10146115, 11595560, 16233784, 20292230, 40584460, 81168920]

約数ペア:

[(1, 81168920), (2, 40584460), (4, 20292230), (5, 16233784), (7, 11595560), (8, 10146115), (10, 8116892), (14, 5797780), (20, 4058446), (28, 2898890), (35, 2319112), (40, 2029223), (56, 1449445), (70, 1159556), (140, 579778), (280, 289889)]