20117161 has 2 divisors, whose sum is σ = 20117162. Its totient is φ = 20117160.

The previous prime is 20117107. The next prime is 20117173. The reversal of 20117161 is 16171102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20115225 + 1936 = 4485^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117161 - 2¹¹ = 20115113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058580 + 10058581.

It is an arithmetic number, because the mean of its divisors is an integer number (10058581).

Almost surely, 2^20117161 is an apocalyptic number.

It is an amenable number.

20117161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117161 is an equidigital number, since it uses as much as digits as its factorization.

20117161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 20117161 is about 4485.2158253533. The cubic root of 20117161 is about 271.9707698188.

Adding to 20117161 its reverse (16171102), we get a palindrome (36288263).

The spelling of 20117161 in words is "twenty million, one hundred seventeen thousand, one hundred sixty-one".