20765303081 has 2 divisors, whose sum is σ = 20765303082. Its totient is φ = 20765303080.

The previous prime is 20765303077. The next prime is 20765303093. The reversal of 20765303081 is 18030356702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20022250000 + 743053081 = 141500^2 + 27259^2 .

It is a cyclic number.

It is not a de Polignac number, because 20765303081 - 2² = 20765303077 is a prime.

It is a super-2 number, since 2×20765303081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20765303981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382651540 + 10382651541.

It is an arithmetic number, because the mean of its divisors is an integer number (10382651541).

Almost surely, 2^20765303081 is an apocalyptic number.

It is an amenable number.

20765303081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20765303081 is an equidigital number, since it uses as much as digits as its factorization.

20765303081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 20765303081 its reverse (18030356702), we get a palindrome (38795659783).

The spelling of 20765303081 in words is "twenty billion, seven hundred sixty-five million, three hundred three thousand, eighty-one".