20780315089 has 2 divisors, whose sum is σ = 20780315090. Its totient is φ = 20780315088.

The previous prime is 20780315047. The next prime is 20780315113. The reversal of 20780315089 is 98051308702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20745505089 + 34810000 = 144033^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20780315089 - 2¹⁵ = 20780282321 is a prime.

It is not a weakly prime, because it can be changed into another prime (20780315989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390157544 + 10390157545.

It is an arithmetic number, because the mean of its divisors is an integer number (10390157545).

Almost surely, 2^20780315089 is an apocalyptic number.

It is an amenable number.

20780315089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780315089 is an equidigital number, since it uses as much as digits as its factorization.

20780315089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 20780315089 in words is "twenty billion, seven hundred eighty million, three hundred fifteen thousand, eighty-nine".