20780315047 has 2 divisors, whose sum is σ = 20780315048. Its totient is φ = 20780315046.

The previous prime is 20780315021. The next prime is 20780315089. The reversal of 20780315047 is 74051308702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20780315047 is a prime.

It is a super-2 number, since 2×20780315047² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20780314997 and 20780315015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20780315947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390157523 + 10390157524.

It is an arithmetic number, because the mean of its divisors is an integer number (10390157524).

Almost surely, 2^20780315047 is an apocalyptic number.

20780315047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780315047 is an equidigital number, since it uses as much as digits as its factorization.

20780315047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 20780315047 in words is "twenty billion, seven hundred eighty million, three hundred fifteen thousand, forty-seven".