NOTE: I changed the headline from $23 million to $20.6 million to reflect the fact that Romney loaned his campaign $2.35 million.

Via Hotline.

UPDATE: The National Journal projection had been $19-$21 million, so this number is within that range.

UPDATE II:
More details from Hotline:

The Campaign opted to raise no general election funds and raised $20.63 million in primary contributions.

The total includes a $2.35 million loan from Governor Romney and a $20,000 transfer from his 1994 Senate campaign.

Contributions were received from all 50 States and Washington, D.C.

UPDATE III:

Via email, another campaign points out this AP story from January:

“Although A Multimillionaire, Romney Said That Contributing Any Of His Personal Wealth To The Campaign ‘Would Be Akin To A Nightmare’ Even Though He Reserved The Right To Do So Should Circumstances Warrant.” (Glen Johnson, “Romney Kicks Off Presidential Campaign With Fundraising Blitz,” The Associated Press, 1/9/07)

Meanwhile, a Romney staffer tells Politico: “That loan was made at the beginning of the the campaign’s exploratory phase to assist and fund startup operations involving hardware and initial staffing.”

So in other words, the loan would have been made in early January, around the same point at which Romney said self-funding “would be akin to a nightmare.” No doubt, the Romney team would argue that paying for startup costs was an example of circumstances warranting dipping into his own bank account.