20116689 has 4 divisors (see below), whose sum is σ = 26822256. Its totient is φ = 13411124.

The previous prime is 20116667. The next prime is 20116717. The reversal of 20116689 is 98661102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20116689 - 2⁹ = 20116177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20116619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352779 + ... + 3352784.

It is an arithmetic number, because the mean of its divisors is an integer number (6705564).

Almost surely, 2^20116689 is an apocalyptic number.

It is an amenable number.

20116689 is a deficient number, since it is larger than the sum of its proper divisors (6705567).

20116689 is an equidigital number, since it uses as much as digits as its factorization.

20116689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705566.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20116689 is about 4485.1632077328. The cubic root of 20116689 is about 271.9686427591.

The spelling of 20116689 in words is "twenty million, one hundred sixteen thousand, six hundred eighty-nine".