20431402535 has 4 divisors (see below), whose sum is σ = 24517683048. Its totient is φ = 16345122024.

The previous prime is 20431402517. The next prime is 20431402547. The reversal of 20431402535 is 53520413402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20431402535 - 2¹⁸ = 20431140391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20431402498 and 20431402507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043140249 + ... + 2043140258.

It is an arithmetic number, because the mean of its divisors is an integer number (6129420762).

Almost surely, 2^20431402535 is an apocalyptic number.

20431402535 is a deficient number, since it is larger than the sum of its proper divisors (4086280513).

20431402535 is an equidigital number, since it uses as much as digits as its factorization.

20431402535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086280512.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20431402535 its reverse (53520413402), we get a palindrome (73951815937).

The spelling of 20431402535 in words is "twenty billion, four hundred thirty-one million, four hundred two thousand, five hundred thirty-five".