31320020232 has 48 divisors (see below), whose sum is σ = 84867297840. Its totient is φ = 10434807648.

The previous prime is 31320020219. The next prime is 31320020243. The reversal of 31320020232 is 23202002313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38643 + ... + 253245.

It is an arithmetic number, because the mean of its divisors is an integer number (1768068705).

Almost surely, 2^31320020232 is an apocalyptic number.

It is an amenable number.

31320020232 is an abundant number, since it is smaller than the sum of its proper divisors (53547277608).

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

31320020232 is a wasteful number, since it uses less digits than its factorization.

31320020232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216642 (or 216635 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 31320020232 its reverse (23202002313), we get a palindrome (54522022545).

The spelling of 31320020232 in words is "thirty-one billion, three hundred twenty million, twenty thousand, two hundred thirty-two".