20733228 has 18 divisors (see below), whose sum is σ = 52409084. Its totient is φ = 6911064.

The previous prime is 20733227. The next prime is 20733233. The reversal of 20733228 is 82233702.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20733221) 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 5 ways as a sum of consecutive naturals, for example, 287926 + ... + 287997.

Almost surely, 2^20733228 is an apocalyptic number.

It is an amenable number.

20733228 is an abundant number, since it is smaller than the sum of its proper divisors (31675856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20733228 is a wasteful number, since it uses less digits than its factorization.

20733228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575933 (or 575928 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20733228 is about 4553.3754512449. The cubic root of 20733228 is about 274.7191755844.

The spelling of 20733228 in words is "twenty million, seven hundred thirty-three thousand, two hundred twenty-eight".