200,000
20.0 × 1015 written in regular notation is 20,000,000,000,000,000 (20 quadrillion).
It is 2.7*10^20
20 in scientific notation is 2 x 10^1
6^20 equals 3.65615844*10^15 expressed in scientific notation
Expanded Notation of 20 = (2 x 10) + (0 x 1)
625
The terminology can vary, but the following example shows the usual names: 1,023 is in standard form. One thousand twenty-three is in word form. 1000 + 20 + 3 is in expanded form. I expect that 'ordinary notation' means standard notation.
Based on your abbreviation for mathematics, I guess you are American. American usage of Standard Notation is to mean ordinary numbers - ie a number written normally. It is the opposite of expanded notation whereby the number is written as the sum of its digits each multiplied by its place value column. For example 123.4 is standard notation; in expanded notation it would be written as 100 + 20 + 3 + 0.4 In the UK, Standard Notation is used to mean scientific notation (or standard index notation) which is a number with one non-zero digit before a decimal point multiplied by a power of 10. It is a way of writing ordinary numbers, especially very big or little ones. For example 123.4 is an ordinary number which is 1.234 × 10² in standard notation. By multiplying out the standard notation the ordinary number is retrieved: 1.234 × 10² = 1.234 × 100 = 123.4
20.0 × 1015 written in regular notation is 20,000,000,000,000,000 (20 quadrillion).
It is 2.7*10^20
20 in scientific notation is 2 x 10^1
The standard atomic notation for an atom of argon with 20 neutrons and 18 protons is 38Ar.
20
6^20 equals 3.65615844*10^15 expressed in scientific notation
Expanded Notation of 20 = (2 x 10) + (0 x 1)
That's known as scientific notation. The scientific notation of 1439 is 1.439 x 103 The scientific notation of four million is 4 x 106
20 zeroes: 2.5 × 1021 written in regular notation is 2,500,000,000,000,000,000,000