21640

Names of 21640

• Cardinal: 21640 can be written as Twenty-one thousand, six hundred forty.

Scientific notation

• Scientific notation: 2.164 × 10⁴

Factors of 21640

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 548

Divisors of 21640

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 4 5 8 10 20 40 541 1082 2164 2705 4328 5410 10820 21640
• Sum of all divisors σ(n): 48780
• Sum of proper divisors (its aliquot sum) s(n): 27140
• 21640 is an abundant number, because the sum of its proper divisors (27140) is greater than itself. Its abundance is 5500

Bases of 21640

• Binary: 101010010001000₂
• Hexadecimal: 0x5488
• Base-36: GP4

Squares and roots of 21640

• 21640 squared (21640²) is 468289600
• 21640 cubed (21640³) is 10133786944000
• The square root of 21640 is 147.1054043875
• The cube root of 21640 is 27.8667134705

Scales and comparisons

• 21,640 seconds is equal to 6 hours, 40 seconds.
• To count from 1 to 21,640 would take you about six hours.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21640 cubic inches would be around 2.3 feet tall.

Recreational maths with 21640

• 21640 backwards is 04612
• The number of decimal digits it has is: 5
• The sum of 21640's digits is 13
• More coming soon!