20965881593 has 2 divisors, whose sum is σ = 20965881594. Its totient is φ = 20965881592.

The previous prime is 20965881583. The next prime is 20965881617. The reversal of 20965881593 is 39518856902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20531450944 + 434430649 = 143288^2 + 20843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20965881593 - 2⁴ = 20965881577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20965881583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482940796 + 10482940797.

It is an arithmetic number, because the mean of its divisors is an integer number (10482940797).

Almost surely, 2^20965881593 is an apocalyptic number.

It is an amenable number.

20965881593 is a deficient number, since it is larger than the sum of its proper divisors (1).

20965881593 is an equidigital number, since it uses as much as digits as its factorization.

20965881593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 20965881593 in words is "twenty billion, nine hundred sixty-five million, eight hundred eighty-one thousand, five hundred ninety-three".