20431894823 has 2 divisors, whose sum is σ = 20431894824. Its totient is φ = 20431894822.

The previous prime is 20431894799. The next prime is 20431894829. The reversal of 20431894823 is 32849813402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20431894823 - 2¹⁰ = 20431893799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431894829) 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, 10215947411 + 10215947412.

It is an arithmetic number, because the mean of its divisors is an integer number (10215947412).

Almost surely, 2^20431894823 is an apocalyptic number.

20431894823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431894823 is an equidigital number, since it uses as much as digits as its factorization.

20431894823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 20431894823 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, eight hundred twenty-three".