20047439782873 has 4 divisors (see below), whose sum is σ = 20049150472960. Its totient is φ = 20045729092788.

The previous prime is 20047439782859. The next prime is 20047439782879. The reversal of 20047439782873 is 37828793474002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20047439782873 - 2⁹ = 20047439782361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20047439782879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855327465 + ... + 855350902.

It is an arithmetic number, because the mean of its divisors is an integer number (5012287618240).

Almost surely, 2^{20047439782873} is an apocalyptic number.

It is an amenable number.

20047439782873 is a deficient number, since it is larger than the sum of its proper divisors (1710690087).

20047439782873 is a wasteful number, since it uses less digits than its factorization.

20047439782873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710690086.

The product of its (nonzero) digits is 113799168, while the sum is 64.

The spelling of 20047439782873 in words is "twenty trillion, forty-seven billion, four hundred thirty-nine million, seven hundred eighty-two thousand, eight hundred seventy-three".