20990

Names of 20990

• Cardinal: 20990 can be written as Twenty thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 2.099 × 10⁴

Factors of 20990

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 2106

Divisors of 20990

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 5 10 2099 4198 10495 20990
• Sum of all divisors σ(n): 37800
• Sum of proper divisors (its aliquot sum) s(n): 16810
• 20990 is a deficient number, because the sum of its proper divisors (16810) is less than itself. Its deficiency is 4180

Bases of 20990

• Binary: 101000111111110₂
• Hexadecimal: 0x51FE
• Base-36: G72

Squares and roots of 20990

• 20990 squared (20990²) is 440580100
• 20990 cubed (20990³) is 9247776299000
• The square root of 20990 is 144.8792600755
• The cube root of 20990 is 27.5848618237

Scales and comparisons

• 20,990 seconds is equal to 5 hours, 49 minutes, 50 seconds.
• To count from 1 to 20,990 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 20990 cubic inches would be around 2.3 feet tall.

Recreational maths with 20990

• 20990 backwards is 09902
• The number of decimal digits it has is: 5
• The sum of 20990's digits is 20
• More coming soon!