20186161 has 2 divisors, whose sum is σ = 20186162. Its totient is φ = 20186160.

The previous prime is 20186143. The next prime is 20186167. The reversal of 20186161 is 16168102.

20186161 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 6533136 = 3695^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 20186161 - 2²¹ = 18089009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20186167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10093080 + 10093081.

It is an arithmetic number, because the mean of its divisors is an integer number (10093081).

Almost surely, 2^20186161 is an apocalyptic number.

It is an amenable number.

20186161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20186161 is an equidigital number, since it uses as much as digits as its factorization.

20186161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20186161 is about 4492.9011785260. The cubic root of 20186161 is about 272.2813598455.

The spelling of 20186161 in words is "twenty million, one hundred eighty-six thousand, one hundred sixty-one".