20971236715 has 32 divisors (see below), whose sum is σ = 29576062656. Its totient is φ = 14073346560.

The previous prime is 20971236679. The next prime is 20971236733. The reversal of 20971236715 is 51763217902.

It is not a de Polignac number, because 20971236715 - 2⁹ = 20971236203 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3380997 + ... + 3387193.

It is an arithmetic number, because the mean of its divisors is an integer number (924251958).

Almost surely, 2^20971236715 is an apocalyptic number.

20971236715 is a deficient number, since it is larger than the sum of its proper divisors (8604825941).

20971236715 is a wasteful number, since it uses less digits than its factorization.

20971236715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10959.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 20971236715 in words is "twenty billion, nine hundred seventy-one million, two hundred thirty-six thousand, seven hundred fifteen".