33131320 has 32 divisors (see below), whose sum is σ = 75322800. Its totient is φ = 13114368.

The previous prime is 33131309. The next prime is 33131323. The reversal of 33131320 is 2313133.

It is a junction number, because it is equal to n+sod(n) for n = 33131294 and 33131303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 8149.

Almost surely, 2^33131320 is an apocalyptic number.

It is an amenable number.

33131320 is an abundant number, since it is smaller than the sum of its proper divisors (42191480).

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

33131320 is a wasteful number, since it uses less digits than its factorization.

33131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8647 (or 8643 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 33131320 is about 5755.9812369395. The cubic root of 33131320 is about 321.1783379647.

Adding to 33131320 its reverse (2313133), we get a palindrome (35444453).

The spelling of 33131320 in words is "thirty-three million, one hundred thirty-one thousand, three hundred twenty".