20634891733 has 2 divisors, whose sum is σ = 20634891734. Its totient is φ = 20634891732.

The previous prime is 20634891731. The next prime is 20634891743. The reversal of 20634891733 is 33719843602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14782182724 + 5852709009 = 121582^2 + 76503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634891733 - 2¹ = 20634891731 is a prime.

Together with 20634891731, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20634891731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317445866 + 10317445867.

It is an arithmetic number, because the mean of its divisors is an integer number (10317445867).

Almost surely, 2^20634891733 is an apocalyptic number.

It is an amenable number.

20634891733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634891733 is an equidigital number, since it uses as much as digits as its factorization.

20634891733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20634891733 in words is "twenty billion, six hundred thirty-four million, eight hundred ninety-one thousand, seven hundred thirty-three".