20939671733 has 2 divisors, whose sum is σ = 20939671734. Its totient is φ = 20939671732.

The previous prime is 20939671729. The next prime is 20939671771. The reversal of 20939671733 is 33717693902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20604305764 + 335365969 = 143542^2 + 18313^2 .

It is a cyclic number.

It is not a de Polignac number, because 20939671733 - 2² = 20939671729 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20939671793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469835866 + 10469835867.

It is an arithmetic number, because the mean of its divisors is an integer number (10469835867).

Almost surely, 2^20939671733 is an apocalyptic number.

It is an amenable number.

20939671733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939671733 is an equidigital number, since it uses as much as digits as its factorization.

20939671733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 50.

The spelling of 20939671733 in words is "twenty billion, nine hundred thirty-nine million, six hundred seventy-one thousand, seven hundred thirty-three".