31104820 has 24 divisors (see below), whose sum is σ = 67573800. Its totient is φ = 12012672.

The previous prime is 31104779. The next prime is 31104833. The reversal of 31104820 is 2840113.

It can be written as a sum of positive squares in 4 ways, for example, as 10201636 + 20903184 = 3194^2 + 4572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26235 + ... + 27394.

It is an arithmetic number, because the mean of its divisors is an integer number (2815575).

Almost surely, 2^31104820 is an apocalyptic number.

It is an amenable number.

31104820 is an abundant number, since it is smaller than the sum of its proper divisors (36468980).

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

31104820 is a wasteful number, since it uses less digits than its factorization.

31104820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53667 (or 53665 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31104820 is about 5577.1695330158. The cubic root of 31104820 is about 314.4917309227.

Adding to 31104820 its reverse (2840113), we get a palindrome (33944933).

The spelling of 31104820 in words is "thirty-one million, one hundred four thousand, eight hundred twenty".