Enables interleukin-20 binding activity. Acts upstream of or within cytokine-mediated signaling pathway; positive regulation of intrinsic apoptotic signaling pathway; and regulation of bone resorption. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be integral component of plasma membrane. Is expressed in epididymis; eye; and ileum. Orthologous to human IL20RA (interleukin 20 receptor subunit alpha). [provided by Alliance of Genome Resources, Apr 2022]