20316161 has 2 divisors, whose sum is σ = 20316162. Its totient is φ = 20316160.

The previous prime is 20316151. The next prime is 20316203. The reversal of 20316161 is 16161302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12559936 + 7756225 = 3544^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 20316161 - 2¹⁸ = 20054017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20316151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158080 + 10158081.

It is an arithmetic number, because the mean of its divisors is an integer number (10158081).

It is a Proth number, since it is equal to 155 ⋅ 2¹⁷ + 1 and 155 < 2¹⁷.

Almost surely, 2^20316161 is an apocalyptic number.

It is an amenable number.

20316161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20316161 is an equidigital number, since it uses as much as digits as its factorization.

20316161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20316161 is about 4507.3452275148. The cubic root of 20316161 is about 272.8646119420.

Adding to 20316161 its reverse (16161302), we get a palindrome (36477463).

It can be divided in two parts, 2031 and 6161, that added together give a 13-th power (8192 = 2¹³).

The spelling of 20316161 in words is "twenty million, three hundred sixteen thousand, one hundred sixty-one".