Many annotation tools are available : prokka, bakta, ncbi pgap

There are various tools you can use for annotation and gene prediction apart from ugene, here are some tools which may help you in performing the gene prediction and functional annotations:

Best Wishes,

Romit

I would say better to make a proper strategy for your project. 24000 nt is very small data, and you might be doing useless work in processing it. Try to get good sequence of genome prior you go for assembly or annotations.