20528279 has 4 divisors (see below), whose sum is σ = 20537376. Its totient is φ = 20519184.

The previous prime is 20528267. The next prime is 20528281. The reversal of 20528279 is 97282502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20528279 - 2⁸ = 20528023 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 (20518279) 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, 1682 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (5134344).

Almost surely, 2^20528279 is an apocalyptic number.

20528279 is a deficient number, since it is larger than the sum of its proper divisors (9097).

20528279 is an equidigital number, since it uses as much as digits as its factorization.

20528279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20528279 is about 4530.8143859576. The cubic root of 20528279 is about 273.8109721502.

The spelling of 20528279 in words is "twenty million, five hundred twenty-eight thousand, two hundred seventy-nine".