20504823 has 4 divisors (see below), whose sum is σ = 27339768. Its totient is φ = 13669880.

The previous prime is 20504777. The next prime is 20504843. The reversal of 20504823 is 32840502.

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 20504823 - 2²¹ = 18407671 is a prime.

It is a super-2 number, since 2×20504823² = 840895532522658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20504793 and 20504802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504843) 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, 3417468 + ... + 3417473.

It is an arithmetic number, because the mean of its divisors is an integer number (6834942).

Almost surely, 2^20504823 is an apocalyptic number.

20504823 is a deficient number, since it is larger than the sum of its proper divisors (6834945).

20504823 is an equidigital number, since it uses as much as digits as its factorization.

20504823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834944.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20504823 is about 4528.2251489960. The cubic root of 20504823 is about 273.7066452056.

The spelling of 20504823 in words is "twenty million, five hundred four thousand, eight hundred twenty-three".