33131420 has 24 divisors (see below), whose sum is σ = 79515744. Its totient is φ = 11359296.

The previous prime is 33131393. The next prime is 33131429. The reversal of 33131420 is 2413133.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131429) 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, 118187 + ... + 118466.

It is an arithmetic number, because the mean of its divisors is an integer number (3313156).

Almost surely, 2^33131420 is an apocalyptic number.

It is an amenable number.

33131420 is an abundant number, since it is smaller than the sum of its proper divisors (46384324).

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

33131420 is a wasteful number, since it uses less digits than its factorization.

33131420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236669 (or 236667 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 33131420 is about 5755.9899235492. The cubic root of 33131420 is about 321.1786611011.

Adding to 33131420 its reverse (2413133), we get a palindrome (35544553).

The spelling of 33131420 in words is "thirty-three million, one hundred thirty-one thousand, four hundred twenty".