18021066 has 32 divisors (see below), whose sum is σ = 41366400. Its totient is φ = 5126976.

The previous prime is 18021061. The next prime is 18021083. The reversal of 18021066 is 66012081.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18021061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10860 + ... + 12408.

It is an arithmetic number, because the mean of its divisors is an integer number (1292700).

Almost surely, 2^18021066 is an apocalyptic number.

18021066 is an abundant number, since it is smaller than the sum of its proper divisors (23345334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18021066 is a wasteful number, since it uses less digits than its factorization.

18021066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18021066 is about 4245.1226130702. The cubic root of 18021066 is about 262.1763375963.

The spelling of 18021066 in words is "eighteen million, twenty-one thousand, sixty-six".