20431806005 has 16 divisors (see below), whose sum is σ = 26428341744. Its totient is φ = 15074296320.

The previous prime is 20431805987. The next prime is 20431806007. The reversal of 20431806005 is 50060813402.

It can be written as a sum of positive squares in 8 ways, for example, as 1363234084 + 19068571921 = 36922^2 + 138089^2 .

It is not a de Polignac number, because 20431806005 - 2⁶ = 20431805941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431806007) 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 in 15 ways as a sum of consecutive naturals, for example, 71966 + ... + 214575.

It is an arithmetic number, because the mean of its divisors is an integer number (1651771359).

Almost surely, 2^20431806005 is an apocalyptic number.

It is an amenable number.

20431806005 is a deficient number, since it is larger than the sum of its proper divisors (5996535739).

20431806005 is a wasteful number, since it uses less digits than its factorization.

20431806005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287656.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 20431806005 in words is "twenty billion, four hundred thirty-one million, eight hundred six thousand, five".