The host at this IP address is obviously operated by cybercriminals. It is running a malware botnet controller which is being used to control infected computers (bots) around the globe using a trojan horse.
Malware botnet controller located at 20.83.245.27 on port 1604 TCP:
$ telnet 20.83.245.27 1604
Trying 20.83.245.27…
Connected to 20.83.245.27.
Escape character is ‘^]’
Referencing malware samples (MD5 hash):
70640074d3fdae9d73d37db169c4e2fb — AV detection: 11 / 68 (16.18%)