20809

Names of 20809

• Cardinal: 20809 can be written as Twenty thousand, eight hundred nine.

Scientific notation

• Scientific notation: 2.0809 × 10⁴

Factors of 20809

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 20809

Divisors of 20809

• Number of divisors d(n): 2
• Complete list of divisors:
  1 20809
• Sum of all divisors σ(n): 20810
• Sum of proper divisors (its aliquot sum) s(n): 1
• 20809 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 20808

Bases of 20809

• Binary: 101000101001001₂
• Hexadecimal: 0x5149
• Base-36: G21

Squares and roots of 20809

• 20809 squared (20809²) is 433014481
• 20809 cubed (20809³) is 9010598335129
• The square root of 20809 is 144.2532495301
• The cube root of 20809 is 27.5053433143

Scales and comparisons

• 20,809 seconds is equal to 5 hours, 46 minutes, 49 seconds.
• To count from 1 to 20,809 would take you about five 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 20809 cubic inches would be around 2.3 feet tall.

Recreational maths with 20809

• 20809 backwards is 90802
• The number of decimal digits it has is: 5
• The sum of 20809's digits is 19
• More coming soon!