20608689 has 4 divisors (see below), whose sum is σ = 27478256. Its totient is φ = 13739124.

The previous prime is 20608681. The next prime is 20608723. The reversal of 20608689 is 98680602.

20608689 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20608689 - 2³ = 20608681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20608681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3434779 + ... + 3434784.

It is an arithmetic number, because the mean of its divisors is an integer number (6869564).

Almost surely, 2^20608689 is an apocalyptic number.

It is an amenable number.

20608689 is a deficient number, since it is larger than the sum of its proper divisors (6869567).

20608689 is an equidigital number, since it uses as much as digits as its factorization.

20608689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6869566.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 20608689 is about 4539.6793939661. The cubic root of 20608689 is about 274.1680154814.

The spelling of 20608689 in words is "twenty million, six hundred eight thousand, six hundred eighty-nine".