25 is the number I've uncovered via Google. Sometimes the media fit the story to what is expected.

Sometimes archaeologists do the same, take Skara Brae, the settlement is thought to have been the home of some 55 souls yet the archaeologists say the Ring of Broger points to the settlement being part of a much more complex society, why, because they cannot imagine the stone circle being built by so few people. Yet they have no idea at all how many souls would have been needed for it's construction.