20775698117 has 2 divisors, whose sum is σ = 20775698118. Its totient is φ = 20775698116.

The previous prime is 20775698101. The next prime is 20775698123. The reversal of 20775698117 is 71189657702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12839382721 + 7936315396 = 113311^2 + 89086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20775698117 - 2⁴ = 20775698101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20775698137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387849058 + 10387849059.

It is an arithmetic number, because the mean of its divisors is an integer number (10387849059).

Almost surely, 2^20775698117 is an apocalyptic number.

It is an amenable number.

20775698117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775698117 is an equidigital number, since it uses as much as digits as its factorization.

20775698117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 20775698117 in words is "twenty billion, seven hundred seventy-five million, six hundred ninety-eight thousand, one hundred seventeen".