33920913 has 16 divisors (see below), whose sum is σ = 50279936. Its totient is φ = 20200320.

The previous prime is 33920911. The next prime is 33920921. The reversal of 33920913 is 31902933.

It is not a de Polignac number, because 33920913 - 2¹ = 33920911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33920911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12820 + ... + 15237.

It is an arithmetic number, because the mean of its divisors is an integer number (3142496).

Almost surely, 2^33920913 is an apocalyptic number.

It is an amenable number.

33920913 is a deficient number, since it is larger than the sum of its proper divisors (16359023).

33920913 is a wasteful number, since it uses less digits than its factorization.

33920913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28104.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 33920913 is about 5824.1662922688. The cubic root of 33920913 is about 323.7097976844.

The spelling of 33920913 in words is "thirty-three million, nine hundred twenty thousand, nine hundred thirteen".