20640

Names of 20640

• Cardinal: 20640 can be written as Twenty thousand, six hundred forty.

Scientific notation

• Scientific notation: 2.064 × 10⁴

Factors of 20640

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 53

Divisors of 20640

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 43 48 60 80 86 96 120 129 160 172 215 240 258 344 430 480 516 645 688 860 1032 1290 1376 1720 2064 2580 3440 4128 5160 6880 10320 20640
• Sum of all divisors σ(n): 66528
• Sum of proper divisors (its aliquot sum) s(n): 45888
• 20640 is an abundant number, because the sum of its proper divisors (45888) is greater than itself. Its abundance is 25248

Bases of 20640

• Binary: 101000010100000₂
• Hexadecimal: 0x50A0
• Base-36: FXC

Squares and roots of 20640

• 20640 squared (20640²) is 426009600
• 20640 cubed (20640³) is 8792838144000
• The square root of 20640 is 143.6662799685
• The cube root of 20640 is 27.4306794015

Scales and comparisons

• 20,640 seconds is equal to 5 hours, 44 minutes.
• To count from 1 to 20,640 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 20640 cubic inches would be around 2.3 feet tall.

Recreational maths with 20640

• 20640 backwards is 04602
• 20640 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 20640's digits is 12
• More coming soon!