18520093 has 4 divisors (see below), whose sum is σ = 18562720. Its totient is φ = 18477468.

The previous prime is 18520063. The next prime is 18520097. The reversal of 18520093 is 39002581.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39002581 = 521 ⋅74861.

It is a cyclic number.

It is not a de Polignac number, because 18520093 - 2²¹ = 16422941 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 (18520097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20655 + ... + 21532.

It is an arithmetic number, because the mean of its divisors is an integer number (4640680).

Almost surely, 2^18520093 is an apocalyptic number.

It is an amenable number.

18520093 is a deficient number, since it is larger than the sum of its proper divisors (42627).

18520093 is an equidigital number, since it uses as much as digits as its factorization.

18520093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42626.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 18520093 is about 4303.4977634478. The cubic root of 18520093 is about 264.5743397829.

The spelling of 18520093 in words is "eighteen million, five hundred twenty thousand, ninety-three".