20.—(1) Where probate is granted to one or some of two or more persons named as executors, whether or not power is reserved to the other or others to prove, all the powers which are by this Act or otherwise by law conferred on the personal representative may be exercised by the proving executor or executors or the survivor or survivors of them and shall be as effectual as if all the persons named as executors had concurred therein.

(2) This section applies whether the testator died before or after the commencement of this Act.