20431894829 has 2 divisors, whose sum is σ = 20431894830. Its totient is φ = 20431894828.

The previous prime is 20431894823. The next prime is 20431894897. The reversal of 20431894829 is 92849813402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18448973929 + 1982920900 = 135827^2 + 44530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20431894829 - 2¹² = 20431890733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431894823) 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, 10215947414 + 10215947415.

It is an arithmetic number, because the mean of its divisors is an integer number (10215947415).

Almost surely, 2^20431894829 is an apocalyptic number.

It is an amenable number.

20431894829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431894829 is an equidigital number, since it uses as much as digits as its factorization.

20431894829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 20431894829 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, eight hundred twenty-nine".