18020396 has 6 divisors (see below), whose sum is σ = 31535700. Its totient is φ = 9010196.

The previous prime is 18020389. The next prime is 18020399. The reversal of 18020396 is 69302081.

It is not an unprimeable number, because it can be changed into a prime (18020399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2252546 + ... + 2252553.

It is an arithmetic number, because the mean of its divisors is an integer number (5255950).

Almost surely, 2^18020396 is an apocalyptic number.

It is an amenable number.

18020396 is a deficient number, since it is larger than the sum of its proper divisors (13515304).

18020396 is a wasteful number, since it uses less digits than its factorization.

18020396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505103 (or 4505101 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18020396 is about 4245.0436982439. The cubic root of 18020396 is about 262.1730884300.

The spelling of 18020396 in words is "eighteen million, twenty thousand, three hundred ninety-six".