ur dream really means a lot and wants to tell u something very serious...well i think so that some one needs your help. and 20 does mean a lot..may be at age or any hotel room number or something else...some one is trying to tell u what has happened or will happen..i think so may be its the past which u must know.
or it can also be an alarm for any upcoming problem. and as u have seen these much, i am sure that you will get the connection some or the other day...i m damn sure..me too had many such experiences.