20431342330 has 24 divisors (see below), whose sum is σ = 42780730068. Its totient is φ = 7005031488.

The previous prime is 20431342301. The next prime is 20431342331. The reversal of 20431342330 is 3324313402.

It can be written as a sum of positive squares in 2 ways, for example, as 20250143809 + 181198521 = 142303^2 + 13461^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20431342295 and 20431342304.

It is not an unprimeable number, because it can be changed into a prime (20431342331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20847819 + ... + 20848798.

Almost surely, 2^20431342330 is an apocalyptic number.

20431342330 is an abundant number, since it is smaller than the sum of its proper divisors (22349387738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431342330 is a wasteful number, since it uses less digits than its factorization.

20431342330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41696638 (or 41696631 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 20431342330 its reverse (3324313402), we get a palindrome (23755655732).

The spelling of 20431342330 in words is "twenty billion, four hundred thirty-one million, three hundred forty-two thousand, three hundred thirty".