18205244 has 6 divisors (see below), whose sum is σ = 31859184. Its totient is φ = 9102620.

The previous prime is 18205241. The next prime is 18205261. The reversal of 18205244 is 44250281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18205241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2275652 + ... + 2275659.

It is an arithmetic number, because the mean of its divisors is an integer number (5309864).

Almost surely, 2^18205244 is an apocalyptic number.

It is an amenable number.

18205244 is a deficient number, since it is larger than the sum of its proper divisors (13653940).

18205244 is a wasteful number, since it uses less digits than its factorization.

18205244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551315 (or 4551313 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18205244 is about 4266.7603635545. The cubic root of 18205244 is about 263.0664725211.

The spelling of 18205244 in words is "eighteen million, two hundred five thousand, two hundred forty-four".