18020145 has 64 divisors (see below), whose sum is σ = 35094528. Its totient is φ = 7776000.

The previous prime is 18020143. The next prime is 18020173. The reversal of 18020145 is 54102081.

18020145 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 18020145 - 2¹ = 18020143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18020143) 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 63 ways as a sum of consecutive naturals, for example, 66360 + ... + 66630.

It is an arithmetic number, because the mean of its divisors is an integer number (548352).

Almost surely, 2^18020145 is an apocalyptic number.

18020145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18020145 is a deficient number, since it is larger than the sum of its proper divisors (17074383).

18020145 is a wasteful number, since it uses less digits than its factorization.

18020145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18020145 is about 4245.0141342521. The cubic root of 18020145 is about 262.1718711843.

The spelling of 18020145 in words is "eighteen million, twenty thousand, one hundred forty-five".