20644166716 has 12 divisors (see below), whose sum is σ = 38252426688. Its totient is φ = 9714901952.

The previous prime is 20644166689. The next prime is 20644166723. The reversal of 20644166716 is 61766144602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151795276 + ... + 151795411.

It is an arithmetic number, because the mean of its divisors is an integer number (3187702224).

Almost surely, 2^20644166716 is an apocalyptic number.

It is an amenable number.

20644166716 is a deficient number, since it is larger than the sum of its proper divisors (17608259972).

20644166716 is a wasteful number, since it uses less digits than its factorization.

20644166716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303590708 (or 303590706 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 20644166716 in words is "twenty billion, six hundred forty-four million, one hundred sixty-six thousand, seven hundred sixteen".