1: εἴκοσι
(Strong's #1501 — Noun — eikosi — i'-kos-ee )

occurs in Luke 14:31; John 6:19; Acts 1:15; 27:28; 1—Corinthians 10:8; of the "four and twenty" elders, in Revelation 4:4 (twice),10; 5:8; 11:16; 19:4 (combined in one numeral with tessares, "four," in some mss.).