20979175668 has 48 divisors (see below), whose sum is σ = 53411344896. Its totient is φ = 6356158560.

The previous prime is 20979175663. The next prime is 20979175681. The reversal of 20979175668 is 86657197902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979175661) 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 15 ways as a sum of consecutive naturals, for example, 945105 + ... + 967047.

It is an arithmetic number, because the mean of its divisors is an integer number (1112736352).

Almost surely, 2^20979175668 is an apocalyptic number.

It is an amenable number.

20979175668 is an abundant number, since it is smaller than the sum of its proper divisors (32432169228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20979175668 is a wasteful number, since it uses less digits than its factorization.

20979175668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29204 (or 29202 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 60.

The spelling of 20979175668 in words is "twenty billion, nine hundred seventy-nine million, one hundred seventy-five thousand, six hundred sixty-eight".