20639353688 has 16 divisors (see below), whose sum is σ = 38713093080. Its totient is φ = 10315862208.

The previous prime is 20639353681. The next prime is 20639353699. The reversal of 20639353688 is 88635393602.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639353681) 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, 453770 + ... + 497177.

Almost surely, 2^20639353688 is an apocalyptic number.

It is an amenable number.

20639353688 is a deficient number, since it is larger than the sum of its proper divisors (18073739392).

20639353688 is a wasteful number, since it uses less digits than its factorization.

20639353688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953666 (or 953662 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 20639353688 in words is "twenty billion, six hundred thirty-nine million, three hundred fifty-three thousand, six hundred eighty-eight".