20304623 has 4 divisors (see below), whose sum is σ = 20369808. Its totient is φ = 20239440.

The previous prime is 20304619. The next prime is 20304667. The reversal of 20304623 is 32640302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20304623 - 2² = 20304619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20304595 and 20304604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304023) 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, 32123 + ... + 32748.

It is an arithmetic number, because the mean of its divisors is an integer number (5092452).

Almost surely, 2^20304623 is an apocalyptic number.

20304623 is a deficient number, since it is larger than the sum of its proper divisors (65185).

20304623 is an equidigital number, since it uses as much as digits as its factorization.

20304623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65184.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20304623 is about 4506.0651349043. The cubic root of 20304623 is about 272.8129468648.

Adding to 20304623 its reverse (32640302), we get a palindrome (52944925).

The spelling of 20304623 in words is "twenty million, three hundred four thousand, six hundred twenty-three".