20716216464 has 80 divisors (see below), whose sum is σ = 53820037440. Its totient is φ = 6866411520.

The previous prime is 20716216447. The next prime is 20716216471. The reversal of 20716216464 is 46461261702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6810784 + ... + 6813824.

It is an arithmetic number, because the mean of its divisors is an integer number (672750468).

Almost surely, 2^20716216464 is an apocalyptic number.

20716216464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20716216464 is an abundant number, since it is smaller than the sum of its proper divisors (33103820976).

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

20716216464 is a wasteful number, since it uses less digits than its factorization.

20716216464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808 (or 3802 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 20716216464 in words is "twenty billion, seven hundred sixteen million, two hundred sixteen thousand, four hundred sixty-four".