638361

素因数分解:

$3^5\times {\mathrm{37}}^1\times {\mathrm{71}}^1$

素因数の和:123

約数の個数: 24

約数和(自身を含む): 995904

約数和(自身を除く): 357543

約数列:

[1, 3, 9, 27, 37, 71, 81, 111, 213, 243, 333, 639, 999, 1917, 2627, 2997, 5751, 7881, 8991, 17253, 23643, 70929, 212787, 638361]

約数ペア:

[(1, 638361), (3, 212787), (9, 70929), (27, 23643), (37, 17253), (71, 8991), (81, 7881), (111, 5751), (213, 2997), (243, 2627), (333, 1917), (639, 999)]