18020986 has 16 divisors (see below), whose sum is σ = 29094120. Its totient is φ = 8340480.

The previous prime is 18020971. The next prime is 18020993. The reversal of 18020986 is 68902081.

It can be written as a sum of positive squares in 4 ways, for example, as 16281225 + 1739761 = 4035^2 + 1319^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2271 + ... + 6418.

Almost surely, 2^18020986 is an apocalyptic number.

18020986 is a deficient number, since it is larger than the sum of its proper divisors (11073134).

18020986 is a wasteful number, since it uses less digits than its factorization.

18020986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8769.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18020986 is about 4245.1131904815. The cubic root of 18020986 is about 262.1759496404.

The spelling of 18020986 in words is "eighteen million, twenty thousand, nine hundred eighty-six".