1820

Names of 1820

• Cardinal: 1820 can be written as One thousand, eight hundred twenty.

Scientific notation

• Scientific notation: 1.82 × 10³

Factors of 1820

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 27

Divisors of 1820

• Number of divisors d(n): 24
• Complete list of divisors:
  1 2 4 5 7 10 13 14 20 26 28 35 52 65 70 91 130 140 182 260 364 455 910 1820
• Sum of all divisors σ(n): 4704
• Sum of proper divisors (its aliquot sum) s(n): 2884
• 1820 is an abundant number, because the sum of its proper divisors (2884) is greater than itself. Its abundance is 1064

Bases of 1820

• Binary: 11100011100₂
• Hexadecimal: 0x71C
• Base-36: 1EK

Squares and roots of 1820

• 1820 squared (1820²) is 3312400
• 1820 cubed (1820³) is 6028568000
• The square root of 1820 is 42.6614580151
• The cube root of 1820 is 12.2092914975

Scales and comparisons

• 1,820 seconds is equal to 30 minutes, 20 seconds.
• To count from 1 to 1,820 would take you about thirty minutes.

  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 1820 cubic inches would be around 1 feet tall.

Recreational maths with 1820

• 1820 backwards is 0281
• The number of decimal digits it has is: 4
• The sum of 1820's digits is 11
• More coming soon!