20200309 has 2 divisors, whose sum is σ = 20200310. Its totient is φ = 20200308.

The previous prime is 20200289. The next prime is 20200337. The reversal of 20200309 is 90300202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 8538084 = 3415^2 + 2922^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200309 - 2⁷ = 20200181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200292 and 20200301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100154 + 10100155.

It is an arithmetic number, because the mean of its divisors is an integer number (10100155).

Almost surely, 2^20200309 is an apocalyptic number.

It is an amenable number.

20200309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200309 is an equidigital number, since it uses as much as digits as its factorization.

20200309 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 20200309 is about 4494.4753865162. The cubic root of 20200309 is about 272.3449568324.

The spelling of 20200309 in words is "twenty million, two hundred thousand, three hundred nine".