20212228 has 12 divisors (see below), whose sum is σ = 35951692. Its totient is φ = 9940320.

The previous prime is 20212223. The next prime is 20212259. The reversal of 20212228 is 82221202.

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 19998784 = 462^2 + 4472^2 .

It is a super-4 number, since 4×20212228⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (20212223) 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, 41175 + ... + 41662.

Almost surely, 2^20212228 is an apocalyptic number.

It is an amenable number.

20212228 is a deficient number, since it is larger than the sum of its proper divisors (15739464).

20212228 is a wasteful number, since it uses less digits than its factorization.

20212228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82902 (or 82900 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20212228 is about 4495.8011521863. The cubic root of 20212228 is about 272.3985111503.

The spelling of 20212228 in words is "twenty million, two hundred twelve thousand, two hundred twenty-eight".