20389043 has 4 divisors (see below), whose sum is σ = 20734680. Its totient is φ = 20043408.

The previous prime is 20389027. The next prime is 20389049. The reversal of 20389043 is 34098302.

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 20389043 - 2⁴ = 20389027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20388997 and 20389015.

It is not an unprimeable number, because it can be changed into a prime (20389049) 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, 172730 + ... + 172847.

It is an arithmetic number, because the mean of its divisors is an integer number (5183670).

Almost surely, 2^20389043 is an apocalyptic number.

20389043 is a deficient number, since it is larger than the sum of its proper divisors (345637).

20389043 is an equidigital number, since it uses as much as digits as its factorization.

20389043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345636.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20389043 is about 4515.4227930505. The cubic root of 20389043 is about 273.1905131661.

The spelling of 20389043 in words is "twenty million, three hundred eighty-nine thousand, forty-three".