Names of 1820
| Nominal | 1820 |
| Cardinal | one thousand eight hundred twenty |
| Ordinal | 1,820th |
| This number as US currency | one thousand eight hundred twenty dollars |
| Is 1820 an odd number? | 1820 is NOT an odd number |
| Is 1820 an even number? | 1820 is an even number |
| Is 1820 a palindrome? | 1820 is NOT a palindrome number |
| Is 1820 a triangle number? | 1820 is NOT a triangle number |
1820 in other Bases
| Base 2 (Binary) | 111000111002 |
| Base 3 (Ternary) | 21111023 |
| Base 4 (Quaternary) | 1301304 |
| Base 5 (Quinary) | 242405 |
| Base 6 (Senary) | 122326 |
| Base 8 (Octal) | 34348 |
| Base 12 (Duodecimal) | 107812 |
| Base 16 (Hexadecimal) | 71C16 |
| Base 20 (Vigesimal) | 4B020 |
Primes and Factors tests for 1820
| Is 1820 a Prime Number? | 1820 is NOT a prime |
| Is 1820 a perfect number? | 1820 is NOT a perfect number |
| Is 1820 a Mersenne Prime? | 1820 is NOT a Mersenne prime |
| Is 1820 a Fermat Prime? | 1820 is NOT a Fermat prime |
| Is 1820 a Fibonacci Prime? | 1820 is NOT a Fibonacci prime |
| Is 1820 a Partition Prime? | 1820 is NOT a Partition prime |
| Is 1820 a Pell Prime? | 1820 is NOT a Pell prime |
| Prime Factors | Prime factors of 1820 |
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1820 in other Numerals
| 1820 in Roman Numeral | MDCCCXX |
| 1820 in Chinese Numeral | 壹仟捌佰貳拾 |
| 1820 in Egyptian Numeral | 𓆼𓍩𓎇 |
| 1820 in Babylonian Numeral |   |
Roots and stuff for 1820
| Is 1820 a square number? | 1820 is NOT a square number |
| Is 1820 a cube number? | 1820 is NOT a cube number |
| Square root of the number 1820 | 42.661458015403 |
| Cube root of the number 1820 | 12.209291497468 |
Recreational math for 1820
| Number 1820 reversed | 0281 |
| Sum of the digits | 11 |
| No of digits | 4 |