20001

Names of 20001

• Cardinal: 20001 can be written as Twenty thousand and one.

Scientific notation

• Scientific notation: 2.0001 × 10⁴

Factors of 20001

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 175

Divisors of 20001

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 59 113 177 339 6667 20001
• Sum of all divisors σ(n): 27360
• Sum of proper divisors (its aliquot sum) s(n): 7359
• 20001 is a deficient number, because the sum of its proper divisors (7359) is less than itself. Its deficiency is 12642

Bases of 20001

• Binary: 100111000100001₂
• Hexadecimal: 0x4E21
• Base-36: FFL

Squares and roots of 20001

• 20001 squared (20001²) is 400040001
• 20001 cubed (20001³) is 8001200060001
• The square root of 20001 is 141.4248917271
• The cube root of 20001 is 27.1446285613

Scales and comparisons

• 20,001 seconds is equal to 5 hours, 33 minutes, 21 seconds.
• To count from 1 to 20,001 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 20001 cubic inches would be around 2.3 feet tall.

Recreational maths with 20001

• 20001 backwards is 10002
• 20001 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 20001's digits is 3
• More coming soon!