18205313 has 12 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 15403752.

The previous prime is 18205273. The next prime is 18205321. The reversal of 18205313 is 31350281.

It is not a de Polignac number, because 18205313 - 2¹⁰ = 18204289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18205333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1520 + ... + 6222.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^18205313 is an apocalyptic number.

It is an amenable number.

18205313 is a deficient number, since it is larger than the sum of its proper divisors (3244927).

18205313 is an equidigital number, since it uses as much as digits as its factorization.

18205313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796 (or 4789 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18205313 is about 4266.7684493068. The cubic root of 18205313 is about 263.0668048716.

Adding to 18205313 its reverse (31350281), we get a palindrome (49555594).

The spelling of 18205313 in words is "eighteen million, two hundred five thousand, three hundred thirteen".