20716395689 has 4 divisors (see below), whose sum is σ = 22599704400. Its totient is φ = 18833086980.

The previous prime is 20716395643. The next prime is 20716395751. The reversal of 20716395689 is 98659361702.

It is a happy number.

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 20716395689 - 2⁸ = 20716395433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20716395629) 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 in 3 ways as a sum of consecutive naturals, for example, 941654339 + ... + 941654360.

It is an arithmetic number, because the mean of its divisors is an integer number (5649926100).

Almost surely, 2^20716395689 is an apocalyptic number.

It is an amenable number.

20716395689 is a deficient number, since it is larger than the sum of its proper divisors (1883308711).

20716395689 is a wasteful number, since it uses less digits than its factorization.

20716395689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883308710.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 20716395689 in words is "twenty billion, seven hundred sixteen million, three hundred ninety-five thousand, six hundred eighty-nine".