20320131432 has 32 divisors (see below), whose sum is σ = 50868017280. Its totient is φ = 6764352000.

The previous prime is 20320131421. The next prime is 20320131479. The reversal of 20320131432 is 23413102302.

It is a junction number, because it is equal to n+sod(n) for n = 20320131399 and 20320131408.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 545673 + ... + 581720.

It is an arithmetic number, because the mean of its divisors is an integer number (1589625540).

Almost surely, 2^20320131432 is an apocalyptic number.

It is an amenable number.

20320131432 is an abundant number, since it is smaller than the sum of its proper divisors (30547885848).

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

20320131432 is a wasteful number, since it uses less digits than its factorization.

20320131432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128153 (or 1128149 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20320131432 its reverse (23413102302), we get a palindrome (43733233734).

The spelling of 20320131432 in words is "twenty billion, three hundred twenty million, one hundred thirty-one thousand, four hundred thirty-two".