21557029689

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{20472013}}^1$

素因数の和:20472038

約数の個数: 20

約数和(自身を含む): 34679591716

約数和(自身を除く): 13122562027

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 351, 1053, 20472013, 61416039, 184248117, 266136169, 552744351, 798408507, 1658233053, 2395225521, 7185676563, 21557029689]

約数ペア:

[(1, 21557029689), (3, 7185676563), (9, 2395225521), (13, 1658233053), (27, 798408507), (39, 552744351), (81, 266136169), (117, 184248117), (351, 61416039), (1053, 20472013)]