20705233 has 8 divisors (see below), whose sum is σ = 21119616. Its totient is φ = 20294400.

The previous prime is 20705203. The next prime is 20705261. The reversal of 20705233 is 33250702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20705233 - 2⁹ = 20704721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20705203) 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 7 ways as a sum of consecutive naturals, for example, 12948 + ... + 14458.

It is an arithmetic number, because the mean of its divisors is an integer number (2639952).

Almost surely, 2^20705233 is an apocalyptic number.

It is an amenable number.

20705233 is a deficient number, since it is larger than the sum of its proper divisors (414383).

20705233 is a wasteful number, since it uses less digits than its factorization.

20705233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20705233 is about 4550.3003197591. The cubic root of 20705233 is about 274.5954735508.

Adding to 20705233 its reverse (33250702), we get a palindrome (53955935).

The spelling of 20705233 in words is "twenty million, seven hundred five thousand, two hundred thirty-three".