20304423 has 24 divisors (see below), whose sum is σ = 31269888. Its totient is φ = 12666192.

The previous prime is 20304419. The next prime is 20304433. The reversal of 20304423 is 32440302.

It is not a de Polignac number, because 20304423 - 2² = 20304419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20304396 and 20304405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304413) 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 23 ways as a sum of consecutive naturals, for example, 8686 + ... + 10772.

It is an arithmetic number, because the mean of its divisors is an integer number (1302912).

Almost surely, 2^20304423 is an apocalyptic number.

20304423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20304423 is a deficient number, since it is larger than the sum of its proper divisors (10965465).

20304423 is a wasteful number, since it uses less digits than its factorization.

20304423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20304423 is about 4506.0429425384. The cubic root of 20304423 is about 272.8120511284.

Adding to 20304423 its reverse (32440302), we get a palindrome (52744725).

The spelling of 20304423 in words is "twenty million, three hundred four thousand, four hundred twenty-three".