18206481 has 4 divisors (see below), whose sum is σ = 24275312. Its totient is φ = 12137652.

The previous prime is 18206477. The next prime is 18206483. The reversal of 18206481 is 18460281.

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.

It is not a de Polignac number, because 18206481 - 2² = 18206477 is a prime.

It is a super-2 number, since 2×18206481² = 662951900806722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18206483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3034411 + ... + 3034416.

It is an arithmetic number, because the mean of its divisors is an integer number (6068828).

Almost surely, 2^18206481 is an apocalyptic number.

It is an amenable number.

18206481 is a deficient number, since it is larger than the sum of its proper divisors (6068831).

18206481 is an equidigital number, since it uses as much as digits as its factorization.

18206481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6068830.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18206481 is about 4266.9053188464. The cubic root of 18206481 is about 263.0724306186.

The spelling of 18206481 in words is "eighteen million, two hundred six thousand, four hundred eighty-one".