20431331205 has 16 divisors (see below), whose sum is σ = 32695537344. Its totient is φ = 10894907520.

The previous prime is 20431331203. The next prime is 20431331209. The reversal of 20431331205 is 50213313402.

It is not a de Polignac number, because 20431331205 - 2¹ = 20431331203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431331203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16291 + ... + 202800.

It is an arithmetic number, because the mean of its divisors is an integer number (2043471084).

Almost surely, 2^20431331205 is an apocalyptic number.

It is an amenable number.

20431331205 is a deficient number, since it is larger than the sum of its proper divisors (12264206139).

20431331205 is a wasteful number, since it uses less digits than its factorization.

20431331205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225316.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 20431331205 its reverse (50213313402), we get a palindrome (70644644607).

The spelling of 20431331205 in words is "twenty billion, four hundred thirty-one million, three hundred thirty-one thousand, two hundred five".