Twenty six

The twenty-six (26), formerly twenty-six, is the natural number that follows twenty-five and precedes twenty-seven.

Math

• The 26 is a number, which has the following factors::1, 2 and 13. As the sum of its factors is 16 ≤ 26, it is a defective number. The sum of its dividers: 1, 2, 13 and 26 = 42.
• It's a pair number.

• Also, it is a number whose square results in a capital number: 26² = 676.

• A rombocuboctahedron has twenty-six faces.
• A semi-press number.
• There are 26 sporadic groups.
• A pie number.
• Free number of squares.
• 26 is the only integer that is greater than a square (5) ² + 1) and one less than a cube (3 ³ - 1).
• A Ulam number.

Chemistry

• Atomic iron number.

Physics

• The number of time-space dimensions in the theory of bosonic strings.

Astronomy

• Messier M26 object is an open cluster in the Scutum constellation.
• NGC 26 is a spiral galaxy in the Pegasus constellation.
• (26) Proserpina is an asteroid belonging to the asteroid belt

In language

• It's the number of letters in the English alphabet.