31103420 has 48 divisors (see below), whose sum is σ = 67864608. Its totient is φ = 11965440.

The previous prime is 31103419. The next prime is 31103441. The reversal of 31103420 is 2430113.

It is a junction number, because it is equal to n+sod(n) for n = 31103395 and 31103404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67832 + ... + 68288.

It is an arithmetic number, because the mean of its divisors is an integer number (1413846).

Almost surely, 2^31103420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31103420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33932304).

31103420 is an abundant number, since it is smaller than the sum of its proper divisors (36761188).

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

31103420 is a wasteful number, since it uses less digits than its factorization.

31103420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 588 counting only the distinct ones).

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

The square root of 31103420 is about 5577.0440199088. The cubic root of 31103420 is about 314.4870125218.

Adding to 31103420 its reverse (2430113), we get a palindrome (33533533).

The spelling of 31103420 in words is "thirty-one million, one hundred three thousand, four hundred twenty".