20535065281 has 2 divisors, whose sum is σ = 20535065282. Its totient is φ = 20535065280.

The previous prime is 20535065279. The next prime is 20535065293. The reversal of 20535065281 is 18256053502.

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., 12068121025 + 8466944256 = 109855^2 + 92016^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535065281 - 2¹ = 20535065279 is a prime.

It is a super-2 number, since 2×20535065281² (a number of 21 digits) contains 22 as substring.

Together with 20535065279, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20535065281.

It is not a weakly prime, because it can be changed into another prime (20535065261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267532640 + 10267532641.

It is an arithmetic number, because the mean of its divisors is an integer number (10267532641).

Almost surely, 2^20535065281 is an apocalyptic number.

It is an amenable number.

20535065281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535065281 is an equidigital number, since it uses as much as digits as its factorization.

20535065281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 20535065281 in words is "twenty billion, five hundred thirty-five million, sixty-five thousand, two hundred eighty-one".