1920
1920 is the year the League of Nations began work.
- Even
- Composite
Where 1920 fits
Why 1920 is special
The United States never joined, despite an American president having proposed it. The League had no armed force and depended on member states acting, which is the structural weakness its successor tried to address.
1920 is part of
Factors & digit properties
- Divisors (32)
- 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 320, 384, 480, 640, 960, 1920
- Prime factorisation
- 2^7 × 3 × 5
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1920
- Binary
- 11110000000
- Octal
- 3600
- Hexadecimal
- 780
- Roman numeral
- MCMXX
- Scientific notation
- 1.920 × 10^3
Other mathematical patterns
- Abundant number
- Happy number
- Harshad (Niven) number
Related numbers & connections
The League of Nations began work in 1920 without the country that proposed it; the United Nations from 1945 was designed around that failure.
View 1945 →Other connections
- contrasts with1945
why?
Strength 0.50, confidence "high".
Law & regulation
Woodrow Wilson proposed the League and the US Senate declined to ratify membership. An organisation designed around collective enforcement, without its principal advocate and with no forces of its own, had limited means of doing what it existed for.
DocumentedLaw & regulationGeography: International — member statesPeriod: 1920
Common questions
Is 1920 a prime number?
No, 1920 is not prime.
What are the factors of 1920?
The factors of 1920 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 320, 384, 480, 640, 960, 1920.
What is 1920 in Roman numerals?
1920 in Roman numerals is MCMXX.
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