20921

Names of 20921

• Cardinal: 20921 can be written as Twenty thousand, nine hundred twenty-one.

Scientific notation

• Scientific notation: 2.0921 × 10⁴

Factors of 20921

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 20921

Divisors of 20921

• Number of divisors d(n): 2
• Complete list of divisors:
  1 20921
• Sum of all divisors σ(n): 20922
• Sum of proper divisors (its aliquot sum) s(n): 1
• 20921 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 20920

Bases of 20921

• Binary: 101000110111001₂
• Hexadecimal: 0x51B9
• Base-36: G55

Squares and roots of 20921

• 20921 squared (20921²) is 437688241
• 20921 cubed (20921³) is 9156875689961
• The square root of 20921 is 144.6409347315
• The cube root of 20921 is 27.5546022573

Scales and comparisons

• 20,921 seconds is equal to 5 hours, 48 minutes, 41 seconds.
• To count from 1 to 20,921 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 20921 cubic inches would be around 2.3 feet tall.

Recreational maths with 20921

• 20921 backwards is 12902
• The number of decimal digits it has is: 5
• The sum of 20921's digits is 14
• More coming soon!