31113320 has 32 divisors (see below), whose sum is σ = 80006400. Its totient is φ = 10667328.

The previous prime is 31113311. The next prime is 31113323. The reversal of 31113320 is 2331113.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 31113295 and 31113304.

It is not an unprimeable number, because it can be changed into a prime (31113323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55280 + ... + 55839.

It is an arithmetic number, because the mean of its divisors is an integer number (2500200).

Almost surely, 2^31113320 is an apocalyptic number.

It is an amenable number.

31113320 is an abundant number, since it is smaller than the sum of its proper divisors (48893080).

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

31113320 is a wasteful number, since it uses less digits than its factorization.

31113320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111137 (or 111133 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31113320 is about 5577.9315162522. The cubic root of 31113320 is about 314.5203753177.

Adding to 31113320 its reverse (2331113), we get a palindrome (33444433).

It can be divided in two parts, 311 and 13320, that added together give a palindrome (13631).

The spelling of 31113320 in words is "thirty-one million, one hundred thirteen thousand, three hundred twenty".