Today, I discovered that a new Gmail account was automatically connected to my phone without worrying me. The first and last names are the same and email id is a set of strange numbers followed by my name. I downloaded my takeaway archive but I found nothing suspicious, the email account is created on March 20, 2019 (Google's first letter dated the same) and is not used since. Plus, my recovery phone number is automatically set as my personal phone number. I do not know how and why it happened.
Please help, thank you in advance.