18520234 has 4 divisors (see below), whose sum is σ = 27780354. Its totient is φ = 9260116.

The previous prime is 18520217. The next prime is 18520247. The reversal of 18520234 is 43202581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 1006009 = 4185^2 + 1003^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18520199 and 18520208.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4630057 + ... + 4630060.

Almost surely, 2^18520234 is an apocalyptic number.

18520234 is a deficient number, since it is larger than the sum of its proper divisors (9260120).

18520234 is an equidigital number, since it uses as much as digits as its factorization.

18520234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260119.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18520234 is about 4303.5141454397. The cubic root of 18520234 is about 264.5750112138.

The spelling of 18520234 in words is "eighteen million, five hundred twenty thousand, two hundred thirty-four".