20987

Names of 20987

• Cardinal: 20987 can be written as Twenty thousand, nine hundred eighty-seven.

Scientific notation

• Scientific notation: 2.0987 × 10⁴

Factors of 20987

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 708

Divisors of 20987

• Number of divisors d(n): 4
• Complete list of divisors:
  1 31 677 20987
• Sum of all divisors σ(n): 21696
• Sum of proper divisors (its aliquot sum) s(n): 709
• 20987 is a deficient number, because the sum of its proper divisors (709) is less than itself. Its deficiency is 20278

Bases of 20987

• Binary: 101000111111011₂
• Hexadecimal: 0x51FB
• Base-36: G6Z

Squares and roots of 20987

• 20987 squared (20987²) is 440454169
• 20987 cubed (20987³) is 9243811644803
• The square root of 20987 is 144.8689062567
• The cube root of 20987 is 27.5835475705

Scales and comparisons

• 20,987 seconds is equal to 5 hours, 49 minutes, 47 seconds.
• To count from 1 to 20,987 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 20987 cubic inches would be around 2.3 feet tall.

Recreational maths with 20987

• 20987 backwards is 78902
• The number of decimal digits it has is: 5
• The sum of 20987's digits is 26
• More coming soon!