Recognised as Decimal number
4 × 10^20
- Positive
- Decimal
- 0 d.p.
- Exact fraction
- 3 s.f.
4 × 10^20 is a decimal number equal to 400,000,000,000,000,000,000⁄1. It lies between 400,000,000,000,000,000,000 and 400,000,000,000,000,000,000, and as a percentage it is 4 × 10^22%.
Number properties
Absolute value4 × 10^20
SignPositive
Integer part400,000,000,000,000,000,000
Fractional part0
Decimal places0
Ceiling400,000,000,000,000,000,000
Rounded to nearest400,000,000,000,000,000,000
Truncated400,000,000,000,000,000,000
Fractions & ratios
Ratio400,000,000,000,000,000,000 : 1
As a percentage4 × 10^22%
Reciprocal2.5 × 10^-21≈
Arithmetic
Double8 × 10^20
Half2 × 10^20
Square1.6 × 10^41
Cube6.4 × 10^61
Square root20,000,000,000≈
Cube root7,368,062.99728077≈
Negation-4 × 10^20
Natural logarithm47.437996221≈
Logarithm base 1020.6020599913≈
Representations
Decimal4 × 10^20
Scientific notation4 × 10^20
Exponential4e+20
IEEE 754 binary64 (hex)0x4435AF1D78B58C40the exact 64-bit pattern stored
IEEE 754 binary32 (hex)0x61AD78EC32-bit single precision, may lose accuracy
Rounding & precision
Significant figures as written3counted from the digits as typed, not from the value
To 0 decimal places400000000000000000000
To 1 decimal place400000000000000000000.0
To 2 decimal places400000000000000000000.00
To 3 decimal places400000000000000000000.000
To 4 decimal places400000000000000000000.0000
To 1 significant figure4e+20
To 2 significant figures4e+20
To 3 significant figures4e+20
To 4 significant figures4e+20
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Neighbouring values
As a fraction
Also reads as
#400E18 (colour)
- #400E18
- Red
- Dark
- Nearest: Black
#400E18 is a red with RGB values 64, 14, 24 and HSL 348°, 64%, 15%. It is a dark colour, so white text on it reaches 16.2:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#400E18#400E18
HEX#400E18
RGBrgb(64, 14, 24)
RGB (0–1)0.251, 0.0549, 0.0941
RGB percentages25.1%, 5.5%, 9.4%
HSLhsl(348, 64.1%, 15.3%)
HSV / HSBhsv(348, 78.1%, 25.1%)
CMYK0%, 78.1%, 62.5%, 74.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,197,912
CSS custom property--colour: #400E18;
Brightness & contrast
Relative luminance0.0147WCAG 2.x, 0 is black and 1 is white
Perceived brightness37.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.23:1
Contrast with white16.23:1WCAG normal text: AAA
Contrast with black1.29:1WCAG normal text: Fail
Greyscale equivalent#191919
Inverted#BFF1E7
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text16.23:1WCAG large text: AAA
Contrast with black, large text1.29:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#0E4036
Analogous#400E31, #401D0E
Triadic#18400E, #0E1840
Split complementary#0E401D, #0E3140
Tetradic#31400E, #0E4036, #1D0E40
Tints, shades & saturation
Channel breakdown
R64
G14
B24
Red64 (25.1%)
Green14 (5.5%)
Blue24 (9.4%)
Hue348°
Saturation (HSL)64.1%
Lightness15.29%
Dominant channelRed
Hex per channelR 40 · G 0E · B 18
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