The number is the rating of the person who is seeking the game, the other numbers in your post I guess you know are the time control. Rated means the game will count towards your rating, unrated does not count towards your rating.
Wins make a rating go up, losses make it go down. Higher ratings represent better players.
does any one know what it means to have a number and it says rated following your code name for example . xxxxxx 30 10 rated.