20504223 has 24 divisors (see below), whose sum is σ = 30606576. Its totient is φ = 13219200.

The previous prime is 20504221. The next prime is 20504353. The reversal of 20504223 is 32240502.

It is not a de Polignac number, because 20504223 - 2¹ = 20504221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20504196 and 20504205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66636 + ... + 66942.

It is an arithmetic number, because the mean of its divisors is an integer number (1275274).

Almost surely, 2^20504223 is an apocalyptic number.

20504223 is a deficient number, since it is larger than the sum of its proper divisors (10102353).

20504223 is a wasteful number, since it uses less digits than its factorization.

20504223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20504223 is about 4528.1588973887. The cubic root of 20504223 is about 273.7039754989.

Adding to 20504223 its reverse (32240502), we get a palindrome (52744725).

The spelling of 20504223 in words is "twenty million, five hundred four thousand, two hundred twenty-three".