1769. Before paying the price, the buyer shall give notice of the sale to each of the prior and hypothecary creditors designated in the statement, with a request to indicate to him in writing, within 20 days after the request, the amount of their claim and, in the case of a hypothec, the value the creditor attaches to his security, taking into account the rank of his security, the amount for which it is granted, and the value of the charged property.