31325620 has 12 divisors (see below), whose sum is σ = 65783844. Its totient is φ = 12530240.

The previous prime is 31325603. The next prime is 31325627. The reversal of 31325620 is 2652313.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 20593444 = 3276^2 + 4538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31325591 and 31325600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783121 + ... + 783160.

It is an arithmetic number, because the mean of its divisors is an integer number (5481987).

Almost surely, 2^31325620 is an apocalyptic number.

It is an amenable number.

31325620 is an abundant number, since it is smaller than the sum of its proper divisors (34458224).

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

31325620 is a wasteful number, since it uses less digits than its factorization.

31325620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566290 (or 1566288 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 31325620 is about 5596.9295153682. The cubic root of 31325620 is about 315.2341250942.

Adding to 31325620 its reverse (2652313), we get a palindrome (33977933).

The spelling of 31325620 in words is "thirty-one million, three hundred twenty-five thousand, six hundred twenty".