18020211 has 8 divisors (see below), whose sum is σ = 26211264. Its totient is φ = 10921320.

The previous prime is 18020203. The next prime is 18020231. The reversal of 18020211 is 11202081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18020211 - 2³ = 18020203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18020231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273001 + ... + 273066.

It is an arithmetic number, because the mean of its divisors is an integer number (3276408).

Almost surely, 2^18020211 is an apocalyptic number.

18020211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18020211 is a deficient number, since it is larger than the sum of its proper divisors (8191053).

18020211 is a wasteful number, since it uses less digits than its factorization.

18020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546081.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 18020211 is about 4245.0219080707. The cubic root of 18020211 is about 262.1721912579.

Adding to 18020211 its reverse (11202081), we get a palindrome (29222292).

The spelling of 18020211 in words is "eighteen million, twenty thousand, two hundred eleven".