20047439782879 has 2 divisors, whose sum is σ = 20047439782880. Its totient is φ = 20047439782878.

The previous prime is 20047439782859. The next prime is 20047439782891. The reversal of 20047439782879 is 97828793474002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20047439782879 - 2⁹ = 20047439782367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20047439782859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023719891439 + 10023719891440.

It is an arithmetic number, because the mean of its divisors is an integer number (10023719891440).

Almost surely, 2^{20047439782879} is an apocalyptic number.

20047439782879 is a deficient number, since it is larger than the sum of its proper divisors (1).

20047439782879 is an equidigital number, since it uses as much as digits as its factorization.

20047439782879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 341397504, while the sum is 70.

The spelling of 20047439782879 in words is "twenty trillion, forty-seven billion, four hundred thirty-nine million, seven hundred eighty-two thousand, eight hundred seventy-nine".