18920173 has 4 divisors (see below), whose sum is σ = 19103968. Its totient is φ = 18736380.

The previous prime is 18920131. The next prime is 18920203. The reversal of 18920173 is 37102981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18920173 - 2¹⁷ = 18789101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18920123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91743 + ... + 91948.

It is an arithmetic number, because the mean of its divisors is an integer number (4775992).

Almost surely, 2^18920173 is an apocalyptic number.

It is an amenable number.

18920173 is a deficient number, since it is larger than the sum of its proper divisors (183795).

18920173 is a wasteful number, since it uses less digits than its factorization.

18920173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183794.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 18920173 is about 4349.7325205120. The cubic root of 18920173 is about 266.4659376577.

The spelling of 18920173 in words is "eighteen million, nine hundred twenty thousand, one hundred seventy-three".