20431312120 has 16 divisors (see below), whose sum is σ = 45970452360. Its totient is φ = 8172524832.

The previous prime is 20431312117. The next prime is 20431312141. The reversal of 20431312120 is 2121313402.

It is a happy number.

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, 255391362 + ... + 255391441.

Almost surely, 2^20431312120 is an apocalyptic number.

20431312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431312120 is an abundant number, since it is smaller than the sum of its proper divisors (25539140240).

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

20431312120 is a wasteful number, since it uses less digits than its factorization.

20431312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510782814 (or 510782810 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20431312120 its reverse (2121313402), we get a palindrome (22552625522).

The spelling of 20431312120 in words is "twenty billion, four hundred thirty-one million, three hundred twelve thousand, one hundred twenty".