Endangered Species Act Amendments of 2020 This bill amends the Endangered Species Act of 1973 (ESA) to, among other things (1) require state-federal consultation for the conservation and recovery of wildlife; (2) modify requirements for delisting or downlisting a threatened or endangered species; (3) require Interior to cooperate to the maximum extent possible (currently, the maximum extent practicable) with states and Indian tribes in implementing the ESA; (4) include conservation agreements as a factor in determining whether to include or maintain a species on the endangered list; (5) require Interior to make publicly available online the best scientific and commercial data as the basis for ESA regulations; (6) require studies to improve conservation, review conservation factors, and quantify certain expenditures, including litigation expenses; and (7) reauthorize funding for ESA provisions through FY2025.