920
E920 is L-cysteine, a dough conditioner.
- Even
- Composite
Where 920 fits
Why 920 is special
It can be produced from human hair or poultry feathers as well as by fermentation, and the label does not distinguish between them.
Factors & digit properties
- Divisors (16)
- 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920
- Prime factorisation
- 2^3 × 5 × 23
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 920
- Scientific notation
- 9.200 × 10^2
Roman numerals
C M X X
CMXX uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 0 0 1 1 0 0 0
1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 920
Octal
1 6 3 0
1 × 512 + 6 × 64 + 3 × 8 + 0 × 1 = 920
Hexadecimal
3 9 8
3 × 256 + 9 × 16 + 8 × 1 = 920
Read as powers of two: 512 + 256 + 128 + 16 + 8 = 920.
In historical numeral systems
Egyptian
9 coils of rope, 2 hobbles
9 × 100 + 2 × 10 = 920. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 5 vertical wedges (sixties place), 2 corner wedges (units place)
15 × 60 + 20 = 920. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sampi, then kappa, marked as a numeral
sampi-kappa + keraia
sampi + kappa written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then tav, then qof, then kaf
tav-tav-qof-kaf
tav (400) + tav (400) + qof (100) + kaf (20) = 920, written in descending order.
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
Related numbers & connections
Both are additives whose permitted sources include material most consumers would not associate with food.
View 570 →Other connections
- is associated with570
why?
Strength 0.50, confidence "high".
Everyday life
E920 L-cysteine is used to relax dough in bread making. It may be produced by microbial fermentation or by hydrolysis of keratin from hair or feathers, which the additive number does not distinguish.
DocumentedEveryday lifeGeography: European Union and states adopting the E number systemPeriod: 1962–
Common questions
Is 920 a prime number?
No, 920 is not prime.
What are the factors of 920?
The factors of 920 are 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920.
What is 920 in Roman numerals?
920 in Roman numerals is CMXX. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be DCCCCXX, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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: 15 July 2026