20530228 has 12 divisors (see below), whose sum is σ = 36420580. Its totient is φ = 10124352.

The previous prime is 20530219. The next prime is 20530229. The reversal of 20530228 is 82203502.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 13337104 = 2682^2 + 3652^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20530199 and 20530208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530229) 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, 34863 + ... + 35446.

Almost surely, 2^20530228 is an apocalyptic number.

It is an amenable number.

20530228 is a deficient number, since it is larger than the sum of its proper divisors (15890352).

20530228 is a wasteful number, since it uses less digits than its factorization.

20530228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70386 (or 70384 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20530228 is about 4531.0294635988. The cubic root of 20530228 is about 273.8196372814.

The spelling of 20530228 in words is "twenty million, five hundred thirty thousand, two hundred twenty-eight".