20728521

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{983}}^1$

素因数の和:1074

約数の個数: 32

約数和(自身を含む): 34007040

約数和(自身を除く): 13278519

約数列:

[1, 3, 9, 11, 27, 33, 71, 99, 213, 297, 639, 781, 983, 1917, 2343, 2949, 7029, 8847, 10813, 21087, 26541, 32439, 69793, 97317, 209379, 291951, 628137, 767723, 1884411, 2303169, 6909507, 20728521]

約数ペア:

[(1, 20728521), (3, 6909507), (9, 2303169), (11, 1884411), (27, 767723), (33, 628137), (71, 291951), (99, 209379), (213, 97317), (297, 69793), (639, 32439), (781, 26541), (983, 21087), (1917, 10813), (2343, 8847), (2949, 7029)]