20431255281 has 32 divisors (see below), whose sum is σ = 29612605440. Its totient is φ = 12492532800.

The previous prime is 20431255279. The next prime is 20431255291. The reversal of 20431255281 is 18255213402.

It is not a de Polignac number, because 20431255281 - 2¹ = 20431255279 is a prime.

It is a super-2 number, since 2×20431255281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20431255211) 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 31 ways as a sum of consecutive naturals, for example, 189336 + ... + 276966.

It is an arithmetic number, because the mean of its divisors is an integer number (925393920).

Almost surely, 2^20431255281 is an apocalyptic number.

It is an amenable number.

20431255281 is a deficient number, since it is larger than the sum of its proper divisors (9181350159).

20431255281 is a wasteful number, since it uses less digits than its factorization.

20431255281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87797.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 20431255281 its reverse (18255213402), we get a palindrome (38686468683).

The spelling of 20431255281 in words is "twenty billion, four hundred thirty-one million, two hundred fifty-five thousand, two hundred eighty-one".