18020143 has 2 divisors, whose sum is σ = 18020144. Its totient is φ = 18020142.

The previous prime is 18020111. The next prime is 18020173. The reversal of 18020143 is 34102081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18020143 - 2⁵ = 18020111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18020143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18020173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010071 + 9010072.

It is an arithmetic number, because the mean of its divisors is an integer number (9010072).

Almost surely, 2^18020143 is an apocalyptic number.

18020143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020143 is an equidigital number, since it uses as much as digits as its factorization.

18020143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18020143 is about 4245.0138986816. The cubic root of 18020143 is about 262.1718614850.

The spelling of 18020143 in words is "eighteen million, twenty thousand, one hundred forty-three".