20439223 has 6 divisors (see below), whose sum is σ = 23776296. Its totient is φ = 17519292.

The previous prime is 20439191. The next prime is 20439257. The reversal of 20439223 is 32293402.

It is not a de Polignac number, because 20439223 - 2⁵ = 20439191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20439283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208515 + ... + 208612.

It is an arithmetic number, because the mean of its divisors is an integer number (3962716).

Almost surely, 2^20439223 is an apocalyptic number.

20439223 is a deficient number, since it is larger than the sum of its proper divisors (3337073).

20439223 is an equidigital number, since it uses as much as digits as its factorization.

20439223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417141 (or 417134 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20439223 is about 4520.9758902255. The cubic root of 20439223 is about 273.4144482967.

The spelling of 20439223 in words is "twenty million, four hundred thirty-nine thousand, two hundred twenty-three".