20738434823 has 2 divisors, whose sum is σ = 20738434824. Its totient is φ = 20738434822.

The previous prime is 20738434799. The next prime is 20738434837. The reversal of 20738434823 is 32843483702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20738434823 - 2⁸ = 20738434567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20738434523) 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, 10369217411 + 10369217412.

It is an arithmetic number, because the mean of its divisors is an integer number (10369217412).

Almost surely, 2^20738434823 is an apocalyptic number.

20738434823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738434823 is an equidigital number, since it uses as much as digits as its factorization.

20738434823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 44.

The spelling of 20738434823 in words is "twenty billion, seven hundred thirty-eight million, four hundred thirty-four thousand, eight hundred twenty-three".