81401605

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{20899}}^1$

素因数の和:20964

約数の個数: 16

約数和(自身を含む): 105336000

約数和(自身を除く): 23934395

約数列:

[1, 5, 19, 41, 95, 205, 779, 3895, 20899, 104495, 397081, 856859, 1985405, 4284295, 16280321, 81401605]

約数ペア:

[(1, 81401605), (5, 16280321), (19, 4284295), (41, 1985405), (95, 856859), (205, 397081), (779, 104495), (3895, 20899)]