20116997 has 2 divisors, whose sum is σ = 20116998. Its totient is φ = 20116996.

The previous prime is 20116979. The next prime is 20117003. The reversal of 20116997 is 79961102.

Together with previous prime (20116979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 37636 = 4481^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116997 - 2⁸ = 20116741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058498 + 10058499.

It is an arithmetic number, because the mean of its divisors is an integer number (10058499).

Almost surely, 2^20116997 is an apocalyptic number.

It is an amenable number.

20116997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116997 is an equidigital number, since it uses as much as digits as its factorization.

20116997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 20116997 is about 4485.1975430297. The cubic root of 20116997 is about 271.9700307595.

The spelling of 20116997 in words is "twenty million, one hundred sixteen thousand, nine hundred ninety-seven".