You can switch it to any port you want. Problem is that it's super easy to spot on security monitoring tools. I deal with "SSH not on port 22" alerts at least once a month.
It's possible to get around this by tunneling SSH over other protocols: http://dag.wiee.rs/howto/ssh-http-tunneling/. Bear in mind if you do this in a corporate environment, security will throw the largest book they can find at you.
Sure, guys. Of all things to block, let's block the most secure one. That'll really improve our security posture.
At this point, I'm continually surprised they haven't superglued the USB ports.