20320609 has 2 divisors, whose sum is σ = 20320610. Its totient is φ = 20320608.

The previous prime is 20320583. The next prime is 20320669. The reversal of 20320609 is 90602302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1830609 = 4300^2 + 1353^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320609 - 2⁵ = 20320577 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20320609.

It is not a weakly prime, because it can be changed into another prime (20320669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160304 + 10160305.

It is an arithmetic number, because the mean of its divisors is an integer number (10160305).

Almost surely, 2^20320609 is an apocalyptic number.

It is an amenable number.

20320609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320609 is an equidigital number, since it uses as much as digits as its factorization.

20320609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20320609 is about 4507.8386173420. The cubic root of 20320609 is about 272.8845240574.

The spelling of 20320609 in words is "twenty million, three hundred twenty thousand, six hundred nine".