31326420 has 96 divisors (see below), whose sum is σ = 91623168. Its totient is φ = 7990272.

The previous prime is 31326413. The next prime is 31326431. The reversal of 31326420 is 2462313.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 228592 + ... + 228728.

It is an arithmetic number, because the mean of its divisors is an integer number (954408).

Almost surely, 2^31326420 is an apocalyptic number.

31326420 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 31326420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45811584).

31326420 is an abundant number, since it is smaller than the sum of its proper divisors (60296748).

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

31326420 is a wasteful number, since it uses less digits than its factorization.

31326420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 31326420 is about 5597.0009826692. Note that the first 3 decimals coincide. The cubic root of 31326420 is about 315.2368085755.

Adding to 31326420 its reverse (2462313), we get a palindrome (33788733).

The spelling of 31326420 in words is "thirty-one million, three hundred twenty-six thousand, four hundred twenty".