31442320 has 120 divisors (see below), whose sum is σ = 91728504. Its totient is φ = 9934848.

The previous prime is 31442273. The next prime is 31442347. The reversal of 31442320 is 2324413.

It can be written as a sum of positive squares in 4 ways, for example, as 1016064 + 30426256 = 1008^2 + 5516^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50652 + ... + 51268.

Almost surely, 2^31442320 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 31442320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45864252).

31442320 is an abundant number, since it is smaller than the sum of its proper divisors (60286184).

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

31442320 is a wasteful number, since it uses less digits than its factorization.

31442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31442320 is about 5607.3451828829. The cubic root of 31442320 is about 315.6250961670.

Adding to 31442320 its reverse (2324413), we get a palindrome (33766733).

The spelling of 31442320 in words is "thirty-one million, four hundred forty-two thousand, three hundred twenty".