20228756 has 12 divisors (see below), whose sum is σ = 35530068. Its totient is φ = 10077312.

The previous prime is 20228743. The next prime is 20228777. The reversal of 20228756 is 65782202.

It can be written as a sum of positive squares in 2 ways, for example, as 4752400 + 15476356 = 2180^2 + 3934^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8021 + ... + 10236.

It is an arithmetic number, because the mean of its divisors is an integer number (2960839).

Almost surely, 2^20228756 is an apocalyptic number.

It is an amenable number.

20228756 is a deficient number, since it is larger than the sum of its proper divisors (15301312).

20228756 is a wasteful number, since it uses less digits than its factorization.

20228756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18538 (or 18536 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20228756 is about 4497.6389361531. The cubic root of 20228756 is about 272.4727397470.

The spelling of 20228756 in words is "twenty million, two hundred twenty-eight thousand, seven hundred fifty-six".