President Reagan's attorney says he is informing federal and local prosecutors of irregularities in an aborted agreement for the purchase of Reagan's Los Angeles home by a group of local businessmen.

Lawyer Roy D. Miller said Monday that an escrow agreement involved in the transaction appeared to bear Miller's unauthorized signature.

Alden Ogle, one of 11 conservative Republican businessmen who had offered to buy the president's house, called Miller "a goddamn liar" for suggesting the signature might have been added to the document improperly, but said he welcomed an investigation.

Miller said the deal collapsed two weeks ago after he discovered that the group's broker had submitted an escrow agreement listing a $1.9 million purchase price to obtain a mortgage loan.

Miller said that the agreement he had signed called for a $1.03 million purchase price and that a document submitted to the savings and loan company appeared to include his signature Xeroxed from the certified escrow agreement.

Ogle said his group had made no formal application for a loan but submitted several documents pertaining to the sale to get a preliminary decision from the Valley First Federal Savings and Loan and had inadvertently included an earlier draft agreement with the $1.9 million figure. It was "ridiculous" to suggest that the group might have sought tax advantages by claiming a higher selling price, Ogle said, because the discrepancy would have had to be resolved before the deal was closed.

The house was sold last week in an unrelated deal for an undisclosed sum to Los Angeles attorney Steven J. Halpern and the Halpern family trust.