If you own or have ever owned stellar and kept it in a wallet, you will may have realized you can't remove the last 20 XLM from your wallet. There is however a way that it can be done, through a merge or "sweep" site.
Here is the site:
https://thor1887.github.io/stellar-extended-merge/
Enter the address of the wallet that you want to remove the remaining stellar in the first box.
Enter the private key for the wallet you want to remove the remaining stellar in the second box.
Enter the address of the destination in the last box
Choose the Livenet option at the top and select the Merge custom assets checkbox if you want to merge other assets