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\(\overline{ab20}=\overline{20ab}+594\\ 100\overline{ab}+20=100\cdot20+\overline{ab}+594\\ 100\overline{ab}+20=2594+\overline{ab}\\ 100\overline{ab}-\overline{ab}=2594-20\\ 99\overline{ab}=2574\\ \overline{ab}=2574:99=26\\ \Rightarrow\overline{ab20}=2620\)
Vậy \(\overline{ab20}=2620\)