31230320 has 80 divisors (see below), whose sum is σ = 82708992. Its totient is φ = 10855680.

The previous prime is 31230313. The next prime is 31230323. The reversal of 31230320 is 2303213.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 31230295 and 31230304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19469 + ... + 21011.

Almost surely, 2^31230320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31230320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41354496).

31230320 is an abundant number, since it is smaller than the sum of its proper divisors (51478672).

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

31230320 is a wasteful number, since it uses less digits than its factorization.

31230320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1584 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 31230320 is about 5588.4094338193. The cubic root of 31230320 is about 314.9141279321.

Adding to 31230320 its reverse (2303213), we get a palindrome (33533533).

The spelling of 31230320 in words is "thirty-one million, two hundred thirty thousand, three hundred twenty".