18520312 has 8 divisors (see below), whose sum is σ = 34725600. Its totient is φ = 9260152.

The previous prime is 18520291. The next prime is 18520321. The reversal of 18520312 is 21302581.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1157512 + ... + 1157527.

It is an arithmetic number, because the mean of its divisors is an integer number (4340700).

Almost surely, 2^18520312 is an apocalyptic number.

It is an amenable number.

18520312 is a deficient number, since it is larger than the sum of its proper divisors (16205288).

18520312 is a wasteful number, since it uses less digits than its factorization.

18520312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315045 (or 2315041 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18520312 is about 4303.5232077915. The cubic root of 18520312 is about 264.5753826422.

Adding to 18520312 its reverse (21302581), we get a palindrome (39822893).

The spelling of 18520312 in words is "eighteen million, five hundred twenty thousand, three hundred twelve".