18920072 has 8 divisors (see below), whose sum is σ = 35475150. Its totient is φ = 9460032.

The previous prime is 18920071. The next prime is 18920089. The reversal of 18920072 is 27002981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 481636 = 4294^2 + 694^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18920071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1182497 + ... + 1182512.

Almost surely, 2^18920072 is an apocalyptic number.

It is an amenable number.

18920072 is a deficient number, since it is larger than the sum of its proper divisors (16555078).

18920072 is a wasteful number, since it uses less digits than its factorization.

18920072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365015 (or 2365011 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18920072 is about 4349.7209105873. The cubic root of 18920072 is about 266.4654635058.

The spelling of 18920072 in words is "eighteen million, nine hundred twenty thousand, seventy-two".