20604231 has 6 divisors (see below), whose sum is σ = 29761680. Its totient is φ = 13736148.

The previous prime is 20604211. The next prime is 20604247. The reversal of 20604231 is 13240602.

It is a happy number.

It is not a de Polignac number, because 20604231 - 2²¹ = 18507079 is a prime.

It is a super-2 number, since 2×20604231² = 849068670202722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1144671 + ... + 1144688.

It is an arithmetic number, because the mean of its divisors is an integer number (4960280).

Almost surely, 2^20604231 is an apocalyptic number.

20604231 is a deficient number, since it is larger than the sum of its proper divisors (9157449).

20604231 is a wasteful number, since it uses less digits than its factorization.

20604231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289365 (or 2289362 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20604231 is about 4539.1883635734. The cubic root of 20604231 is about 274.1482450316.

Adding to 20604231 its reverse (13240602), we get a palindrome (33844833).

The spelling of 20604231 in words is "twenty million, six hundred four thousand, two hundred thirty-one".