20684789632 has 128 divisors (see below), whose sum is σ = 46667325600. Its totient is φ = 9065226240.

The previous prime is 20684789611. The next prime is 20684789633. The reversal of 20684789632 is 23698748602.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684789633) 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, 2940103 + ... + 2947129.

Almost surely, 2^20684789632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20684789632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23333662800).

20684789632 is an abundant number, since it is smaller than the sum of its proper divisors (25982535968).

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

20684789632 is a wasteful number, since it uses less digits than its factorization.

20684789632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144 (or 7132 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 20684789632 in words is "twenty billion, six hundred eighty-four million, seven hundred eighty-nine thousand, six hundred thirty-two".