20320823 has 4 divisors (see below), whose sum is σ = 21390360. Its totient is φ = 19251288.

The previous prime is 20320787. The next prime is 20320829. The reversal of 20320823 is 32802302.

It is a happy number.

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 20320823 - 2⁶ = 20320759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320795 and 20320804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320829) 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, 534740 + ... + 534777.

It is an arithmetic number, because the mean of its divisors is an integer number (5347590).

Almost surely, 2^20320823 is an apocalyptic number.

20320823 is a deficient number, since it is larger than the sum of its proper divisors (1069537).

20320823 is a wasteful number, since it uses less digits than its factorization.

20320823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069536.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20320823 is about 4507.8623537105. The cubic root of 20320823 is about 272.8854819861.

The spelling of 20320823 in words is "twenty million, three hundred twenty thousand, eight hundred twenty-three".