18220984 has 16 divisors (see below), whose sum is σ = 34295400. Its totient is φ = 9075552.

The previous prime is 18220973. The next prime is 18220987. The reversal of 18220984 is 48902281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220987) 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 in 3 ways as a sum of consecutive naturals, for example, 2082 + ... + 6385.

Almost surely, 2^18220984 is an apocalyptic number.

It is an amenable number.

18220984 is a deficient number, since it is larger than the sum of its proper divisors (16074416).

18220984 is a wasteful number, since it uses less digits than its factorization.

18220984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8742 (or 8738 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18220984 is about 4268.6044557911. The cubic root of 18220984 is about 263.1422652163.

The spelling of 18220984 in words is "eighteen million, two hundred twenty thousand, nine hundred eighty-four".