20431894799 has 2 divisors, whose sum is σ = 20431894800. Its totient is φ = 20431894798.

The previous prime is 20431894753. The next prime is 20431894823. The reversal of 20431894799 is 99749813402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431894799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431894699) 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, 10215947399 + 10215947400.

It is an arithmetic number, because the mean of its divisors is an integer number (10215947400).

Almost surely, 2^20431894799 is an apocalyptic number.

20431894799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431894799 is an equidigital number, since it uses as much as digits as its factorization.

20431894799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 20431894799 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, seven hundred ninety-nine".