20528229 has 16 divisors (see below), whose sum is σ = 28478720. Its totient is φ = 13141440.

The previous prime is 20528203. The next prime is 20528251. The reversal of 20528229 is 92282502.

It is not a de Polignac number, because 20528229 - 2²⁰ = 19479653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20528196 and 20528205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7599 + ... + 9939.

It is an arithmetic number, because the mean of its divisors is an integer number (1779920).

Almost surely, 2^20528229 is an apocalyptic number.

It is an amenable number.

20528229 is a deficient number, since it is larger than the sum of its proper divisors (7950491).

20528229 is a wasteful number, since it uses less digits than its factorization.

20528229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20528229 is about 4530.8088681824. The cubic root of 20528229 is about 273.8107498461.

The spelling of 20528229 in words is "twenty million, five hundred twenty-eight thousand, two hundred twenty-nine".