20359609 has 2 divisors, whose sum is σ = 20359610. Its totient is φ = 20359608.

The previous prime is 20359607. The next prime is 20359631. The reversal of 20359609 is 90695302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 4717584 = 3955^2 + 2172^2 .

It is a cyclic number.

It is not a de Polignac number, because 20359609 - 2¹ = 20359607 is a prime.

Together with 20359607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20359607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10179804 + 10179805.

It is an arithmetic number, because the mean of its divisors is an integer number (10179805).

Almost surely, 2^20359609 is an apocalyptic number.

It is an amenable number.

20359609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20359609 is an equidigital number, since it uses as much as digits as its factorization.

20359609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20359609 is about 4512.1623419376. The cubic root of 20359609 is about 273.0589888944.

The spelling of 20359609 in words is "twenty million, three hundred fifty-nine thousand, six hundred nine".