I assume you mean loan to value ratio. It is a simple ratio: Loan amount divided by the value of the home.
In this instance, this would be 585,000/583,620= loan to value ratio
Most banks like to see no more than a 90% loan to value ratio. This ratio helps the bank know the risk they are incurring by lending you the money to buy the home. The lower the loan to value ratio, the easier it will be for the bank to recoup their investment, therefore usually equals a lower interest rate for the buyer.
In this instance, the loan is more than the value of the home which makes this a risky investment for the bank.