21689109

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{941}}^1$

素因数の和:1157

約数の個数: 24

約数和(自身を含む): 33945912

約数和(自身を除く): 12256803

約数列:

[1, 3, 9, 13, 39, 117, 197, 591, 941, 1773, 2561, 2823, 7683, 8469, 12233, 23049, 36699, 110097, 185377, 556131, 1668393, 2409901, 7229703, 21689109]

約数ペア:

[(1, 21689109), (3, 7229703), (9, 2409901), (13, 1668393), (39, 556131), (117, 185377), (197, 110097), (591, 36699), (941, 23049), (1773, 12233), (2561, 8469), (2823, 7683)]