20164481 has 2 divisors, whose sum is σ = 20164482. Its totient is φ = 20164480.

The previous prime is 20164451. The next prime is 20164493. The reversal of 20164481 is 18446102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19280881 + 883600 = 4391^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164481 - 2¹⁰ = 20163457 is a prime.

It is a super-2 number, since 2×20164481² = 813212587998722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20164481.

It is not a weakly prime, because it can be changed into another prime (20164411) 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, 10082240 + 10082241.

It is an arithmetic number, because the mean of its divisors is an integer number (10082241).

Almost surely, 2^20164481 is an apocalyptic number.

It is an amenable number.

20164481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164481 is an equidigital number, since it uses as much as digits as its factorization.

20164481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20164481 is about 4490.4878354139. The cubic root of 20164481 is about 272.1838479173.

The spelling of 20164481 in words is "twenty million, one hundred sixty-four thousand, four hundred eighty-one".