20750243 has 4 divisors (see below), whose sum is σ = 20767608. Its totient is φ = 20732880.

The previous prime is 20750239. The next prime is 20750263. The reversal of 20750243 is 34205702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20750243 - 2² = 20750239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20750203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6746 + ... + 9327.

It is an arithmetic number, because the mean of its divisors is an integer number (5191902).

Almost surely, 2^20750243 is an apocalyptic number.

20750243 is a deficient number, since it is larger than the sum of its proper divisors (17365).

20750243 is a wasteful number, since it uses less digits than its factorization.

20750243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17364.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20750243 is about 4555.2434622092. The cubic root of 20750243 is about 274.7943056874.

Adding to 20750243 its reverse (34205702), we get a palindrome (54955945).

The spelling of 20750243 in words is "twenty million, seven hundred fifty thousand, two hundred forty-three".