2x seems like a much closer ballpark than 10x, especially with Denmark being part of mainland europe and significantly denser? (Denmark has a higher population than Norway on 1/10th the surface, excluding greenland).
Density may play a role, but Norway, Denmark and Finland have urbanization rates of 83% to 88%. E.g. a fifth of Norway's entire population resides within the Oslo metropolitan area and a fifth of Sweden's population resides within the Stockholm metropolitan area.
