"other files" on my android

I have moved all possible apps and all but the most recent media to my sdcard.  Currently,
Apps+zip files=0.

But this “Other files” contains 20.84gb! 

I have less than 2gb free on my internal memory.

What is this “other files”? Can I access it to clean it up?

just remove the unnecessary apps and then reset the android or update it if possible.

and also have a look to FSAPK TO DOWNLOAD FREE SHADOW FIGHT 3 MOD APK   

and enjoy it for free in your pure android set