Enables interleukin-20 binding activity. Acts upstream of or within several processes, including negative regulation of T cell proliferation; negative regulation of type IV hypersensitivity; and regulation of cytokine production. Predicted to be integral component of plasma membrane. Is expressed in foregut; male reproductive gland or organ; metanephros; skin; and thymus. Orthologous to human IL20RB (interleukin 20 receptor subunit beta). [provided by Alliance of Genome Resources, Apr 2022]