19911231

素因数分解:

$3^3\times {\mathrm{193}}^1\times {\mathrm{3821}}^1$

素因数の和:4023

約数の個数: 16

約数和(自身を含む): 29658720

約数和(自身を除く): 9747489

約数列:

[1, 3, 9, 27, 193, 579, 1737, 3821, 5211, 11463, 34389, 103167, 737453, 2212359, 6637077, 19911231]

約数ペア:

[(1, 19911231), (3, 6637077), (9, 2212359), (27, 737453), (193, 103167), (579, 34389), (1737, 11463), (3821, 5211)]