31310420 has 12 divisors (see below), whose sum is σ = 65751924. Its totient is φ = 12524160.

The previous prime is 31310393. The next prime is 31310431. The reversal of 31310420 is 2401313.

It can be written as a sum of positive squares in 2 ways, for example, as 3579664 + 27730756 = 1892^2 + 5266^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31310395 and 31310404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782741 + ... + 782780.

It is an arithmetic number, because the mean of its divisors is an integer number (5479327).

Almost surely, 2^31310420 is an apocalyptic number.

It is an amenable number.

31310420 is an abundant number, since it is smaller than the sum of its proper divisors (34441504).

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

31310420 is a wasteful number, since it uses less digits than its factorization.

31310420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565530 (or 1565528 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31310420 is about 5595.5714632198. The cubic root of 31310420 is about 315.1831302652.

Adding to 31310420 its reverse (2401313), we get a palindrome (33711733).

The spelling of 31310420 in words is "thirty-one million, three hundred ten thousand, four hundred twenty".