20077081 has 2 divisors, whose sum is σ = 20077082. Its totient is φ = 20077080.

The previous prime is 20077067. The next prime is 20077103. The reversal of 20077081 is 18077002.

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., 14745600 + 5331481 = 3840^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 20077081 - 2⁹ = 20076569 is a prime.

It is a super-2 number, since 2×20077081² = 806178362961122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20078081) 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, 10038540 + 10038541.

It is an arithmetic number, because the mean of its divisors is an integer number (10038541).

Almost surely, 2^20077081 is an apocalyptic number.

It is an amenable number.

20077081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20077081 is an equidigital number, since it uses as much as digits as its factorization.

20077081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20077081 is about 4480.7455852793. The cubic root of 20077081 is about 271.7900313329.

The spelling of 20077081 in words is "twenty million, seventy-seven thousand, eighty-one".