1620
1620 is the year the Mayflower reached North America.
- Even
- Composite
Where 1620 fits
Why 1620 is special
About half the passengers died in the first winter. The Mayflower Compact, signed aboard, is often described as an early self-government document, though it was written to hold a fractious group together rather than to found anything.
1620 is part of
Factors & digit properties
- Divisors (30)
- 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810, 1620
- Prime factorisation
- 2^2 × 3^4 × 5
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1620
- Scientific notation
- 1.620 × 10^3
Roman numerals
M D C X X
Binary
1 1 0 0 1 0 1 0 1 0 0
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 1,620
Octal
3 1 2 4
3 × 512 + 1 × 64 + 2 × 8 + 4 × 1 = 1,620
Hexadecimal
6 5 4
6 × 256 + 5 × 16 + 4 × 1 = 1,620
Read as powers of two: 1,024 + 512 + 64 + 16 + 4 = 1,620.
In historical numeral systems
Egyptian
1 lotus, 6 coils of rope, 2 hobbles
1 × 1,000 + 6 × 100 + 2 × 10 = 1,620. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 7 vertical wedges (sixties place), empty units place
27 × 60 + 0 = 1620. Places are separated by a space on the tablet, with the higher place written first. The second place is empty, and this is precisely the case the early system could not write unambiguously — the same wedges alone would also read as 1.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
1620 is a year in the 17th century, in the 1620s.
The Mayflower arrived in 1620 and the harvest gathering now called the first Thanksgiving followed in 1621, documented in a single short letter.
View 1621 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1621
why?
Strength 0.50, confidence "high".
History
The Mayflower Compact is regularly presented as a founding charter of American self-government. It was drafted because passengers landing outside their patent's jurisdiction were threatening to go their own way, and its purpose was to bind them, not to innovate constitutionally.
DocumentedHistoryGeography: Massachusetts, North AmericaPeriod: 1620In 1620, the Mayflower carried English separatists to Plymouth (North America).
DocumentedHistoryGeography: North AmericaPeriod: 1620
Common questions
Is 1620 a prime number?
No, 1620 is not prime.
What are the factors of 1620?
The factors of 1620 are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810, 1620.
What is 1620 in Roman numerals?
1620 in Roman numerals is MDCXX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026