20918517

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:253

約数の個数: 32

約数和(自身を含む): 30792960

約数和(自身を除く): 9874443

約数列:

[1, 3, 17, 51, 53, 71, 109, 159, 213, 327, 901, 1207, 1853, 2703, 3621, 3763, 5559, 5777, 7739, 11289, 17331, 23217, 63971, 98209, 131563, 191913, 294627, 394689, 410167, 1230501, 6972839, 20918517]

約数ペア:

[(1, 20918517), (3, 6972839), (17, 1230501), (51, 410167), (53, 394689), (71, 294627), (109, 191913), (159, 131563), (213, 98209), (327, 63971), (901, 23217), (1207, 17331), (1853, 11289), (2703, 7739), (3621, 5777), (3763, 5559)]