20528223 has 4 divisors (see below), whose sum is σ = 27370968. Its totient is φ = 13685480.

The previous prime is 20528203. The next prime is 20528251. The reversal of 20528223 is 32282502.

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 20528223 - 2⁸ = 20527967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20528193 and 20528202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528203) 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, 3421368 + ... + 3421373.

It is an arithmetic number, because the mean of its divisors is an integer number (6842742).

Almost surely, 2^20528223 is an apocalyptic number.

20528223 is a deficient number, since it is larger than the sum of its proper divisors (6842745).

20528223 is an equidigital number, since it uses as much as digits as its factorization.

20528223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842744.

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

The square root of 20528223 is about 4530.8082060489. The cubic root of 20528223 is about 273.8107231696.

The spelling of 20528223 in words is "twenty million, five hundred twenty-eight thousand, two hundred twenty-three".