31320223320 has 128 divisors (see below), whose sum is σ = 98305228800. Its totient is φ = 7967798784.

The previous prime is 31320223313. The next prime is 31320223339. The reversal of 31320223320 is 2332202313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1042266 + ... + 1071894.

It is an arithmetic number, because the mean of its divisors is an integer number (768009600).

Almost surely, 2^31320223320 is an apocalyptic number.

31320223320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31320223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49152614400).

31320223320 is an abundant number, since it is smaller than the sum of its proper divisors (66985005480).

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

31320223320 is a wasteful number, since it uses less digits than its factorization.

31320223320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30049 (or 30045 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 31320223320 its reverse (2332202313), we get a palindrome (33652425633).

The spelling of 31320223320 in words is "thirty-one billion, three hundred twenty million, two hundred twenty-three thousand, three hundred twenty".