Hyperbola

Let the lengths of the transverse and conjugate axes of a hyperbola in standard form 2a and 2b, respectively, and one focus and the corresponding directrix of this hyperbola be (−5,0) and 5x+9=0, respectively. If the product of the focal distances of a point (α,2√5) on the hyperbola is p, then 4p is equal to ____ .