\documentclass[12pt,a4paper]{article}
\begin{document}
\begin{table}[ht]
\begin{center}
\caption{All statistics are based on contigs of size $\geq$ 500 bp, unless otherwise noted (e.g., "\# contigs ($\geq$ 0 bp)" and "Total length ($\geq$ 0 bp)" include all contigs).}
\begin{tabular}{|l*{21}{|r}|}
\hline
Assembly & \# contigs ($\geq$ 0 bp) & \# contigs ($\geq$ 1000 bp) & \# contigs ($\geq$ 5000 bp) & \# contigs ($\geq$ 10000 bp) & \# contigs ($\geq$ 25000 bp) & \# contigs ($\geq$ 50000 bp) & Total length ($\geq$ 0 bp) & Total length ($\geq$ 1000 bp) & Total length ($\geq$ 5000 bp) & Total length ($\geq$ 10000 bp) & Total length ($\geq$ 25000 bp) & Total length ($\geq$ 50000 bp) & \# contigs & Largest contig & Total length & GC (\%) & N50 & N75 & L50 & L75 & \# N's per 100 kbp \\ \hline
arowana\_transcripts.fasta.transdecoder.cds & 47765 & 31694 & 2401 & 296 & 6 & 2 & 88693317 & 78588546 & 17845038 & 4113786 & 287265 & 153492 & 42098 & 88050 & 86541075 & 54.72 & 2583 & 1521 & 9748 & 20692 & 11.26 \\ \hline
cds-no\_redundancy & 40089 & 14122 & 198 & 9 & 0 & 0 & 40348176 & 26081310 & 1257993 & 109917 & 0 & 0 & 27136 & 14787 & 35409537 & 54.87 & 1524 & 975 & 7321 & 14604 & 0.00 \\ \hline
\end{tabular}
\end{center}
\end{table}
\end{document}
