20733945 has 16 divisors (see below), whose sum is σ = 33596160. Its totient is φ = 10917504.

The previous prime is 20733943. The next prime is 20734001. The reversal of 20733945 is 54933702.

It is a happy number.

It is not a de Polignac number, because 20733945 - 2¹ = 20733943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20733943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7564 + ... + 9933.

It is an arithmetic number, because the mean of its divisors is an integer number (2099760).

Almost surely, 2^20733945 is an apocalyptic number.

It is an amenable number.

20733945 is a deficient number, since it is larger than the sum of its proper divisors (12862215).

20733945 is a wasteful number, since it uses less digits than its factorization.

20733945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17584.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 20733945 is about 4553.4541833645. The cubic root of 20733945 is about 274.7223423429.

The spelling of 20733945 in words is "twenty million, seven hundred thirty-three thousand, nine hundred forty-five".