20443243 has 4 divisors (see below), whose sum is σ = 20731248. Its totient is φ = 20155240.

The previous prime is 20443201. The next prime is 20443249. The reversal of 20443243 is 34234402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34234402 = 2 ⋅17117201.

It is a cyclic number.

It is not a de Polignac number, because 20443243 - 2⁹ = 20442731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20443249) 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, 143896 + ... + 144037.

It is an arithmetic number, because the mean of its divisors is an integer number (5182812).

Almost surely, 2^20443243 is an apocalyptic number.

20443243 is a deficient number, since it is larger than the sum of its proper divisors (288005).

20443243 is an equidigital number, since it uses as much as digits as its factorization.

20443243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288004.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 20443243 is about 4521.4204626422. The cubic root of 20443243 is about 273.4323722336.

Adding to 20443243 its reverse (34234402), we get a palindrome (54677645).

The spelling of 20443243 in words is "twenty million, four hundred forty-three thousand, two hundred forty-three".