20043181 has 2 divisors, whose sum is σ = 20043182. Its totient is φ = 20043180.

The previous prime is 20043161. The next prime is 20043211. The reversal of 20043181 is 18134002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 285156 = 4445^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043181 - 2⁷ = 20043053 is a prime.

It is a super-2 number, since 2×20043181² = 803458209197522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20043151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021590 + 10021591.

It is an arithmetic number, because the mean of its divisors is an integer number (10021591).

Almost surely, 2^20043181 is an apocalyptic number.

It is an amenable number.

20043181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043181 is an equidigital number, since it uses as much as digits as its factorization.

20043181 is an evil number, because the sum of its binary digits is even.

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

The square root of 20043181 is about 4476.9611345197. The cubic root of 20043181 is about 271.6369733481.

Adding to 20043181 its reverse (18134002), we get a palindrome (38177183).

The spelling of 20043181 in words is "twenty million, forty-three thousand, one hundred eighty-one".