Leverage
leverage=price/(price-mortgage principal) is the number showing how much leverage the mortgage is allowing for your investment. A mortgage with a LTV (Loan To Value) ratio of 0.95 gives you a leverage of 20, LTV=0.8 gives you a leverage of 5, LTV=0.5 gives you a leverage of 2, while purchasing cash LTV=0 results in leverage=1.
This is one of the property key profitability measures.