20967717218704 has 45 divisors (see below), whose sum is σ = 43155866819937. Its totient is φ = 9867014514432.

The previous prime is 20967717218629. The next prime is 20967717218719. The reversal of 20967717218704 is 40781271776902.

The square root of 20967717218704 is 4579052.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16324347315600 + 4643369903104 = 4040340^2 + 2154848^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 311341867 + ... + 311409205.

Almost surely, 2^{20967717218704} is an apocalyptic number.

20967717218704 is the 4579052-nd square number.

It is an amenable number.

20967717218704 is an abundant number, since it is smaller than the sum of its proper divisors (22188149601233).

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

20967717218704 is an frugal number, since it uses more digits than its factorization.

20967717218704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134720 (or 67358 counting only the distinct ones).

The product of its (nonzero) digits is 16595712, while the sum is 61.

The spelling of 20967717218704 in words is "twenty trillion, nine hundred sixty-seven billion, seven hundred seventeen million, two hundred eighteen thousand, seven hundred four".