31344320 has 84 divisors (see below), whose sum is σ = 86868000. Its totient is φ = 10741248.

The previous prime is 31344307. The next prime is 31344329. The reversal of 31344320 is 2344313.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31344292 and 31344301.

It is not an unprimeable number, because it can be changed into a prime (31344329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14681 + ... + 16679.

Almost surely, 2^31344320 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 31344320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43434000).

31344320 is an abundant number, since it is smaller than the sum of its proper divisors (55523680).

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

31344320 is a wasteful number, since it uses less digits than its factorization.

31344320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030 (or 2013 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 31344320 is about 5598.5998249562. The cubic root of 31344320 is about 315.2968395276.

Adding to 31344320 its reverse (2344313), we get a palindrome (33688633).

The spelling of 31344320 in words is "thirty-one million, three hundred forty-four thousand, three hundred twenty".