20218228 has 12 divisors (see below), whose sum is σ = 36049860. Its totient is φ = 9918272.

The previous prime is 20218193. The next prime is 20218259. The reversal of 20218228 is 82281202.

It can be written as a sum of positive squares in 2 ways, for example, as 7171684 + 13046544 = 2678^2 + 3612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47473 + ... + 47896.

It is an arithmetic number, because the mean of its divisors is an integer number (3004155).

Almost surely, 2^20218228 is an apocalyptic number.

It is an amenable number.

20218228 is a deficient number, since it is larger than the sum of its proper divisors (15831632).

20218228 is a wasteful number, since it uses less digits than its factorization.

20218228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95426 (or 95424 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20218228 is about 4496.4683919716. The cubic root of 20218228 is about 272.4254623168.

The spelling of 20218228 in words is "twenty million, two hundred eighteen thousand, two hundred twenty-eight".