251991

素因数分解:

$3^5\times {\mathrm{17}}^1\times {\mathrm{61}}^1$

素因数の和:93

約数の個数: 24

約数和(自身を含む): 406224

約数和(自身を除く): 154233

約数列:

[1, 3, 9, 17, 27, 51, 61, 81, 153, 183, 243, 459, 549, 1037, 1377, 1647, 3111, 4131, 4941, 9333, 14823, 27999, 83997, 251991]

約数ペア:

[(1, 251991), (3, 83997), (9, 27999), (17, 14823), (27, 9333), (51, 4941), (61, 4131), (81, 3111), (153, 1647), (183, 1377), (243, 1037), (459, 549)]