18920073 has 8 divisors (see below), whose sum is σ = 25247200. Its totient is φ = 12603168.

The previous prime is 18920071. The next prime is 18920089. The reversal of 18920073 is 37002981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18920073 - 2¹ = 18920071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18920073.

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 in 7 ways as a sum of consecutive naturals, for example, 4758 + ... + 7776.

It is an arithmetic number, because the mean of its divisors is an integer number (3155900).

Almost surely, 2^18920073 is an apocalyptic number.

It is an amenable number.

18920073 is a deficient number, since it is larger than the sum of its proper divisors (6327127).

18920073 is a wasteful number, since it uses less digits than its factorization.

18920073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 18920073 is about 4349.7210255372. The cubic root of 18920073 is about 266.4654682004.

The spelling of 18920073 in words is "eighteen million, nine hundred twenty thousand, seventy-three".