18520141 has 4 divisors (see below), whose sum is σ = 18533152. Its totient is φ = 18507132.

The previous prime is 18520111. The next prime is 18520147. The reversal of 18520141 is 14102581.

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: 14102581 = 43 ⋅327967.

It is a cyclic number.

It is not a de Polignac number, because 18520141 - 2⁵ = 18520109 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 (18520147) 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, 4065 + ... + 7318.

It is an arithmetic number, because the mean of its divisors is an integer number (4633288).

Almost surely, 2^18520141 is an apocalyptic number.

It is an amenable number.

18520141 is a deficient number, since it is larger than the sum of its proper divisors (13011).

18520141 is a wasteful number, since it uses less digits than its factorization.

18520141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13010.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18520141 is about 4303.5033403031. The cubic root of 18520141 is about 264.5745683555.

The spelling of 18520141 in words is "eighteen million, five hundred twenty thousand, one hundred forty-one".