2020
2020 is the year the COVID-19 pandemic was declared and much of the world locked down.
- Even
- Composite
Where 2020 fits
Why 2020 is special
2020 is the most globally synchronised year in living memory. The WHO declared a pandemic on 11 March and within weeks a large share of the world's population was under some form of restriction. It also became shorthand — 'in 2020' now functions as a marker of disruption in a way few years manage.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020
- Prime factorisation
- 2^2 × 5 × 101
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 2020
- Binary
- 11111100100
- Octal
- 3744
- Hexadecimal
- 7e4
- Roman numeral
- MMXX
- Scientific notation
- 2.020 × 10^3
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Science
The WHO declared COVID-19 a pandemic on 11 March 2020, and within about six weeks a majority of the world's population was under some restriction on movement. Very few events in history have applied to that many people at once, which is why the year functions as a shared reference point rather than a national one.
DocumentedSciencePeriod: 2020
Common questions
Is 2020 a prime number?
No, 2020 is not prime.
What are the factors of 2020?
The factors of 2020 are 1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020.
What is 2020 in Roman numerals?
2020 in Roman numerals is MMXX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026