20047243 has 4 divisors (see below), whose sum is σ = 20065320. Its totient is φ = 20029168.

The previous prime is 20047241. The next prime is 20047253. The reversal of 20047243 is 34274002.

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 20047243 - 2¹ = 20047241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20047241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7258 + ... + 9631.

It is an arithmetic number, because the mean of its divisors is an integer number (5016330).

Almost surely, 2^20047243 is an apocalyptic number.

20047243 is a deficient number, since it is larger than the sum of its proper divisors (18077).

20047243 is a wasteful number, since it uses less digits than its factorization.

20047243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18076.

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

The square root of 20047243 is about 4477.4147674746. The cubic root of 20047243 is about 271.6553223127.

The spelling of 20047243 in words is "twenty million, forty-seven thousand, two hundred forty-three".