20043161 has 2 divisors, whose sum is σ = 20043162. Its totient is φ = 20043160.

The previous prime is 20043151. The next prime is 20043181. The reversal of 20043161 is 16134002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 9803161 = 3200^2 + 3131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043161 is a prime.

It is a Chen prime.

It is equal to p_1273202 and since 20043161 and 1273202 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20043151) 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, 10021580 + 10021581.

It is an arithmetic number, because the mean of its divisors is an integer number (10021581).

Almost surely, 2^20043161 is an apocalyptic number.

It is an amenable number.

20043161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043161 is an equidigital number, since it uses as much as digits as its factorization.

20043161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20043161 is about 4476.9589008612. The cubic root of 20043161 is about 271.6368829974.

Adding to 20043161 its reverse (16134002), we get a palindrome (36177163).

The spelling of 20043161 in words is "twenty million, forty-three thousand, one hundred sixty-one".