20328609 has 32 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 11264832.

The previous prime is 20328589. The next prime is 20328629. The reversal of 20328609 is 90682302.

It is an interprime number because it is at equal distance from previous prime (20328589) and next prime (20328629).

It is not a de Polignac number, because 20328609 - 2⁸ = 20328353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20328629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186447 + ... + 186555.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^20328609 is an apocalyptic number.

It is an amenable number.

20328609 is a deficient number, since it is larger than the sum of its proper divisors (11604831).

20328609 is a wasteful number, since it uses less digits than its factorization.

20328609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20328609 is about 4508.7258732374. The cubic root of 20328609 is about 272.9203299031.

The spelling of 20328609 in words is "twenty million, three hundred twenty-eight thousand, six hundred nine".