18020055 has 8 divisors (see below), whose sum is σ = 28832112. Its totient is φ = 9610688.

The previous prime is 18020039. The next prime is 18020059. The reversal of 18020055 is 55002081.

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

It is a cyclic number.

It is not a de Polignac number, because 18020055 - 2⁴ = 18020039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020059) 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, 600654 + ... + 600683.

It is an arithmetic number, because the mean of its divisors is an integer number (3604014).

Almost surely, 2^18020055 is an apocalyptic number.

18020055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18020055 is a deficient number, since it is larger than the sum of its proper divisors (10812057).

18020055 is a wasteful number, since it uses less digits than its factorization.

18020055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201345.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 18020055 is about 4245.0035335674. The cubic root of 18020055 is about 262.1714347189.

The spelling of 18020055 in words is "eighteen million, twenty thousand, fifty-five".