20891

Names of 20891

• Cardinal: 20891 can be written as Twenty thousand, eight hundred ninety-one.

Scientific notation

• Scientific notation: 2.0891 × 10⁴

Factors of 20891

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1620

Divisors of 20891

• Number of divisors d(n): 4
• Complete list of divisors:
  1 13 1607 20891
• Sum of all divisors σ(n): 22512
• Sum of proper divisors (its aliquot sum) s(n): 1621
• 20891 is a deficient number, because the sum of its proper divisors (1621) is less than itself. Its deficiency is 19270

Bases of 20891

• Binary: 101000110011011₂
• Hexadecimal: 0x519B
• Base-36: G4B

Squares and roots of 20891

• 20891 squared (20891²) is 436433881
• 20891 cubed (20891³) is 9117540207971
• The square root of 20891 is 144.5371924455
• The cube root of 20891 is 27.5414251703

Scales and comparisons

• 20,891 seconds is equal to 5 hours, 48 minutes, 11 seconds.
• To count from 1 to 20,891 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 20891 cubic inches would be around 2.3 feet tall.

Recreational maths with 20891

• 20891 backwards is 19802
• The number of decimal digits it has is: 5
• The sum of 20891's digits is 20
• More coming soon!