20158223 has 4 divisors (see below), whose sum is σ = 20459160. Its totient is φ = 19857288.

The previous prime is 20158211. The next prime is 20158247. The reversal of 20158223 is 32285102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32285102 = 2 ⋅16142551.

It is a cyclic number.

It is not a de Polignac number, because 20158223 - 2⁴ = 20158207 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 (20158283) 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, 150368 + ... + 150501.

It is an arithmetic number, because the mean of its divisors is an integer number (5114790).

Almost surely, 2^20158223 is an apocalyptic number.

20158223 is a deficient number, since it is larger than the sum of its proper divisors (300937).

20158223 is an equidigital number, since it uses as much as digits as its factorization.

20158223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300936.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20158223 is about 4489.7909750900. The cubic root of 20158223 is about 272.1556877949.

The spelling of 20158223 in words is "twenty million, one hundred fifty-eight thousand, two hundred twenty-three".