21105721

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1949}}^1$

素因数の和:1993

約数の個数: 24

約数和(自身を含む): 28009800

約数和(自身を除く): 6904079

約数列:

[1, 7, 13, 17, 49, 91, 119, 221, 637, 833, 1547, 1949, 10829, 13643, 25337, 33133, 95501, 177359, 231931, 430729, 1241513, 1623517, 3015103, 21105721]

約数ペア:

[(1, 21105721), (7, 3015103), (13, 1623517), (17, 1241513), (49, 430729), (91, 231931), (119, 177359), (221, 95501), (637, 33133), (833, 25337), (1547, 13643), (1949, 10829)]