React bundle size increased by more than the file that it included

require(`./path/to/large_file`)

Without this file being required, the React app build bundle resulted in 36 MB.

With this file included, it resulted in 80 MB.

However, the size of the file itself, ./path/to/large_file, is only 21 MB, via this linux command:

du -sh ./path/to/large_file

21 + 36 = 57

80 – 57 = 23

Can someone explain what accounts for this additional 23 MB in size to the bundle?