20688570721

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{263}}^1\times {\mathrm{123491}}^1$

素因数の和:123781

約数の個数: 24

約数和(自身を含む): 26016306624

約数和(自身を除く): 5327735903

約数列:

[1, 7, 13, 49, 91, 263, 637, 1841, 3419, 12887, 23933, 123491, 167531, 864437, 1605383, 6051059, 11237681, 32478133, 78663767, 227346931, 422215729, 1591428517, 2955510103, 20688570721]

約数ペア:

[(1, 20688570721), (7, 2955510103), (13, 1591428517), (49, 422215729), (91, 227346931), (263, 78663767), (637, 32478133), (1841, 11237681), (3419, 6051059), (12887, 1605383), (23933, 864437), (123491, 167531)]