20319807688 has 16 divisors (see below), whose sum is σ = 38159086860. Its totient is φ = 10144051200.

The previous prime is 20319807647. The next prime is 20319807689. The reversal of 20319807688 is 88670891302.

It can be written as a sum of positive squares in 2 ways, for example, as 14094913284 + 6224894404 = 118722^2 + 78898^2 .

It is not an unprimeable number, because it can be changed into a prime (20319807689) 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, 1976133 + ... + 1986388.

Almost surely, 2^20319807688 is an apocalyptic number.

It is an amenable number.

20319807688 is a deficient number, since it is larger than the sum of its proper divisors (17839279172).

20319807688 is a wasteful number, since it uses less digits than its factorization.

20319807688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963168 (or 3963164 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 20319807688 in words is "twenty billion, three hundred nineteen million, eight hundred seven thousand, six hundred eighty-eight".