20990846117 has 2 divisors, whose sum is σ = 20990846118. Its totient is φ = 20990846116.

The previous prime is 20990846057. The next prime is 20990846143. The reversal of 20990846117 is 71164809902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14379367396 + 6611478721 = 119914^2 + 81311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20990846117 - 2¹⁶ = 20990780581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20990846197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10495423058 + 10495423059.

It is an arithmetic number, because the mean of its divisors is an integer number (10495423059).

Almost surely, 2^20990846117 is an apocalyptic number.

It is an amenable number.

20990846117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20990846117 is an equidigital number, since it uses as much as digits as its factorization.

20990846117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 20990846117 in words is "twenty billion, nine hundred ninety million, eight hundred forty-six thousand, one hundred seventeen".