20270161 has 2 divisors, whose sum is σ = 20270162. Its totient is φ = 20270160.

The previous prime is 20270143. The next prime is 20270167. The reversal of 20270161 is 16107202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 2461761 = 4220^2 + 1569^2 .

It is a cyclic number.

It is not a de Polignac number, because 20270161 - 2²¹ = 18173009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20270167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135080 + 10135081.

It is an arithmetic number, because the mean of its divisors is an integer number (10135081).

Almost surely, 2^20270161 is an apocalyptic number.

It is an amenable number.

20270161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20270161 is an equidigital number, since it uses as much as digits as its factorization.

20270161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20270161 is about 4502.2395538221. The cubic root of 20270161 is about 272.6585156335.

Adding to 20270161 its reverse (16107202), we get a palindrome (36377363).

The spelling of 20270161 in words is "twenty million, two hundred seventy thousand, one hundred sixty-one".