20181043 has 2 divisors, whose sum is σ = 20181044. Its totient is φ = 20181042.

The previous prime is 20181019. The next prime is 20181047. The reversal of 20181043 is 34018102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20181043 - 2¹⁷ = 20049971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20181043.

It is not a weakly prime, because it can be changed into another prime (20181047) 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 as a sum of consecutive naturals, namely, 10090521 + 10090522.

It is an arithmetic number, because the mean of its divisors is an integer number (10090522).

Almost surely, 2^20181043 is an apocalyptic number.

20181043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20181043 is an equidigital number, since it uses as much as digits as its factorization.

20181043 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 20181043 is about 4492.3315772547. The cubic root of 20181043 is about 272.2583464918.

Adding to 20181043 its reverse (34018102), we get a palindrome (54199145).

The spelling of 20181043 in words is "twenty million, one hundred eighty-one thousand, forty-three".