To find out who all the space administrators are, please try the SQL queries or user macro from our knowledgebase article:
Confluence spaces don't have owners, exactly. Please see Space Permissions Overview:
The user that creates a space, like when you create your personal space, is automatically an administrator of that space, and they can add other space admins if they want to by adding the Space Admin permission to another user or group.
On my test instance the user macro in this article works to create an automatically updated list of space admins on a Confluence page: How do I view a list of all space administrators for all spaces.
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