20722938915 has 16 divisors (see below), whose sum is σ = 37893374208. Its totient is φ = 9473343456.

The previous prime is 20722938911. The next prime is 20722938917. The reversal of 20722938915 is 51983922702.

It is not a de Polignac number, because 20722938915 - 2² = 20722938911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20722938911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98680557 + ... + 98680766.

It is an arithmetic number, because the mean of its divisors is an integer number (2368335888).

Almost surely, 2^20722938915 is an apocalyptic number.

20722938915 is a deficient number, since it is larger than the sum of its proper divisors (17170435293).

20722938915 is a wasteful number, since it uses less digits than its factorization.

20722938915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197361338.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 20722938915 in words is "twenty billion, seven hundred twenty-two million, nine hundred thirty-eight thousand, nine hundred fifteen".