20716973694 has 64 divisors (see below), whose sum is σ = 47552071680. Its totient is φ = 6678780480.

The previous prime is 20716973677. The next prime is 20716973723. The reversal of 20716973694 is 49637961702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20716973694.

It is a congruent 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, 3926242 + ... + 3931514.

It is an arithmetic number, because the mean of its divisors is an integer number (743001120).

Almost surely, 2^20716973694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20716973694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23776035840).

20716973694 is an abundant number, since it is smaller than the sum of its proper divisors (26835097986).

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

20716973694 is a wasteful number, since it uses less digits than its factorization.

20716973694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7662 (or 7656 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 20716973694 in words is "twenty billion, seven hundred sixteen million, nine hundred seventy-three thousand, six hundred ninety-four".