Don’t remember my trusted number to log into my iPhone X that I forgot the password to.

Re: iPhone X that I forgot the password to.

What to do to get your iPhone working again:

If you forgot your iPhone passcode

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Re: "I don’t remember my trusted number"

A trusted number for Apple ID verification is generally the phone number of the device listed in your Apple ID account, and on which you can get a verification code or text with a code sent from Apple.

Eg: How to: Get a verification code and sign in with two-factor authentication - Apple Support

You may be able to try logging-in to your Apple ID account online, and check or change the trusted number, if you have access.

Apple ID online

https://iforgot.apple.com/appleid

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If you forgot your Apple ID:

(generally an eMail address, else in a few countries it may be a phone number)

Enter information online to find your Apple ID:

https://iforgot.apple.com/appleid

You may have used your Apple ID and Apple ID password to sign in here.

You like likely use it for logging in to FaceTime and Messages etc.

Else:

What to do: If you forgot your Apple ID password – Apple Support

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Also:

Here's a discussion thread on a similar situation:

I forgot my password and trusted phone nu… - Apple Community

All the best :-)