20967161 has 2 divisors, whose sum is σ = 20967162. Its totient is φ = 20967160.

The previous prime is 20967139. The next prime is 20967209. The reversal of 20967161 is 16176902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 319225 = 4544^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20967161 - 2¹⁸ = 20705017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20967061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483580 + 10483581.

It is an arithmetic number, because the mean of its divisors is an integer number (10483581).

Almost surely, 2^20967161 is an apocalyptic number.

It is an amenable number.

20967161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967161 is an equidigital number, since it uses as much as digits as its factorization.

20967161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20967161 is about 4578.9912644599. The cubic root of 20967161 is about 275.7485325939.

The spelling of 20967161 in words is "twenty million, nine hundred sixty-seven thousand, one hundred sixty-one".