20704243 has 8 divisors (see below), whose sum is σ = 24907520. Its totient is φ = 16812360.

The previous prime is 20704219. The next prime is 20704253. The reversal of 20704243 is 34240702.

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 20704243 - 2⁹ = 20703731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20704213) 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, 77703 + ... + 77968.

It is an arithmetic number, because the mean of its divisors is an integer number (3113440).

Almost surely, 2^20704243 is an apocalyptic number.

20704243 is a deficient number, since it is larger than the sum of its proper divisors (4203277).

20704243 is a wasteful number, since it uses less digits than its factorization.

20704243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155697.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20704243 is about 4550.1915344302. The cubic root of 20704243 is about 274.5910969784.

Adding to 20704243 its reverse (34240702), we get a palindrome (54944945).

The spelling of 20704243 in words is "twenty million, seven hundred four thousand, two hundred forty-three".