21680

Names of 21680

• Cardinal: 21680 can be written as Twenty-one thousand, six hundred eighty.

Scientific notation

• Scientific notation: 2.168 × 10⁴

Factors of 21680

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 278

Divisors of 21680

• Number of divisors d(n): 20
• Complete list of divisors:
  1 2 4 5 8 10 16 20 40 80 271 542 1084 1355 2168 2710 4336 5420 10840 21680
• Sum of all divisors σ(n): 50592
• Sum of proper divisors (its aliquot sum) s(n): 28912
• 21680 is an abundant number, because the sum of its proper divisors (28912) is greater than itself. Its abundance is 7232

Bases of 21680

• Binary: 101010010110000₂
• Hexadecimal: 0x54B0
• Base-36: GQ8

Squares and roots of 21680

• 21680 squared (21680²) is 470022400
• 21680 cubed (21680³) is 10190085632000
• The square root of 21680 is 147.2412985545
• The cube root of 21680 is 27.8838727813

Scales and comparisons

• 21,680 seconds is equal to 6 hours, 1 minute, 20 seconds.
• To count from 1 to 21,680 would take you about six 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 21680 cubic inches would be around 2.3 feet tall.

Recreational maths with 21680

• 21680 backwards is 08612
• The number of decimal digits it has is: 5
• The sum of 21680's digits is 17
• More coming soon!