20887142047 has 2 divisors, whose sum is σ = 20887142048. Its totient is φ = 20887142046.

The previous prime is 20887142041. The next prime is 20887142083. The reversal of 20887142047 is 74024178802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20887142047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20887141994 and 20887142012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20887142041) 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 as a sum of consecutive naturals, namely, 10443571023 + 10443571024.

It is an arithmetic number, because the mean of its divisors is an integer number (10443571024).

Almost surely, 2^20887142047 is an apocalyptic number.

20887142047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20887142047 is an equidigital number, since it uses as much as digits as its factorization.

20887142047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 20887142047 in words is "twenty billion, eight hundred eighty-seven million, one hundred forty-two thousand, forty-seven".