20173843 has 4 divisors (see below), whose sum is σ = 20719120. Its totient is φ = 19628568.

The previous prime is 20173799. The next prime is 20173847. The reversal of 20173843 is 34837102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20173843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20173847) 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, 272583 + ... + 272656.

It is an arithmetic number, because the mean of its divisors is an integer number (5179780).

Almost surely, 2^20173843 is an apocalyptic number.

20173843 is a deficient number, since it is larger than the sum of its proper divisors (545277).

20173843 is an equidigital number, since it uses as much as digits as its factorization.

20173843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545276.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20173843 is about 4491.5301401638. The cubic root of 20173843 is about 272.2259647287.

The spelling of 20173843 in words is "twenty million, one hundred seventy-three thousand, eight hundred forty-three".