20722938916 has 24 divisors (see below), whose sum is σ = 37267854624. Its totient is φ = 10077049920.

The previous prime is 20722938911. The next prime is 20722938917. The reversal of 20722938916 is 61983922702.

It is a self number, because there is not a number n which added to its sum of digits gives 20722938916.

It is not an unprimeable number, because it can be changed into a prime (20722938911) 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 7 ways as a sum of consecutive naturals, for example, 218470 + ... + 298621.

It is an arithmetic number, because the mean of its divisors is an integer number (1552827276).

Almost surely, 2^20722938916 is an apocalyptic number.

It is an amenable number.

20722938916 is a deficient number, since it is larger than the sum of its proper divisors (16544915708).

20722938916 is a wasteful number, since it uses less digits than its factorization.

20722938916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517371 (or 517369 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 20722938916 in words is "twenty billion, seven hundred twenty-two million, nine hundred thirty-eight thousand, nine hundred sixteen".