18620244 has 18 divisors (see below), whose sum is σ = 47067930. Its totient is φ = 6206736.

The previous prime is 18620207. The next prime is 18620249. The reversal of 18620244 is 44202681.

18620244 is a `hidden beast` number, since 18 + 620 + 24 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9548100 + 9072144 = 3090^2 + 3012^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18620249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258579 + ... + 258650.

It is an arithmetic number, because the mean of its divisors is an integer number (2614885).

Almost surely, 2^18620244 is an apocalyptic number.

It is an amenable number.

18620244 is an abundant number, since it is smaller than the sum of its proper divisors (28447686).

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

18620244 is a wasteful number, since it uses less digits than its factorization.

18620244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517239 (or 517234 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 18620244 is about 4315.1180748619. The cubic root of 18620244 is about 265.0503950675.

The spelling of 18620244 in words is "eighteen million, six hundred twenty thousand, two hundred forty-four".