18722056 has 8 divisors (see below), whose sum is σ = 35103870. Its totient is φ = 9361024.

The previous prime is 18722051. The next prime is 18722089. The reversal of 18722056 is 65022781.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 2992900 = 3966^2 + 1730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722051) by changing a digit.

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 as a sum of consecutive naturals, namely, 1170121 + ... + 1170136.

Almost surely, 2^18722056 is an apocalyptic number.

It is an amenable number.

18722056 is a deficient number, since it is larger than the sum of its proper divisors (16381814).

18722056 is a wasteful number, since it uses less digits than its factorization.

18722056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340263 (or 2340259 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18722056 is about 4326.8991206174. The cubic root of 18722056 is about 265.5325992059.

The spelling of 18722056 in words is "eighteen million, seven hundred twenty-two thousand, fifty-six".