2020309 has 2 divisors, whose sum is σ = 2020310. Its totient is φ = 2020308.

The previous prime is 2020279. The next prime is 2020313. The reversal of 2020309 is 9030202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 88209 = 1390^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020309 - 2⁷ = 2020181 is a prime.

It is a super-3 number, since 3×2020309³ = 24738573328333090887, which contains 333 as substring.

2020309 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2020292 and 2020301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010154 + 1010155.

It is an arithmetic number, because the mean of its divisors is an integer number (1010155).

2^2020309 is an apocalyptic number.

It is an amenable number.

2020309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020309 is an equidigital number, since it uses as much as digits as its factorization.

2020309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 2020309 is about 1421.3757420190. The cubic root of 2020309 is about 126.4171318511.

The spelling of 2020309 in words is "two million, twenty thousand, three hundred nine".