If your bank offers online services, you should be able to find your bank account number online by logging into your account on your bank’s website and checking your details there.
Keep in mind that each type of account you have with a bank comes with a unique account number. This means if you have a bank account as well as a savings account, for example, your bank account number and your savings account number will be different.
If you don’t have access to your bank account online or can’t login, you should be able to find your account number on a mailed bank statement, if you have one.
Alternatively, you can call your bank’s customer service number or visit a branch to retrieve your account number.