20066161 has 2 divisors, whose sum is σ = 20066162. Its totient is φ = 20066160.

The previous prime is 20066159. The next prime is 20066183. The reversal of 20066161 is 16166002.

It is an a-pointer prime, because the next prime (20066183) can be obtained adding 20066161 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 8294400 = 3431^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20066161 - 2¹ = 20066159 is a prime.

Together with 20066159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20066131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033080 + 10033081.

It is an arithmetic number, because the mean of its divisors is an integer number (10033081).

Almost surely, 2^20066161 is an apocalyptic number.

It is an amenable number.

20066161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066161 is an equidigital number, since it uses as much as digits as its factorization.

20066161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20066161 is about 4479.5268723382. The cubic root of 20066161 is about 271.7407465224.

The spelling of 20066161 in words is "twenty million, sixty-six thousand, one hundred sixty-one".