20694332672 has 72 divisors (see below), whose sum is σ = 44645681640. Its totient is φ = 9516810240.

The previous prime is 20694332629. The next prime is 20694332677. The reversal of 20694332672 is 27623349602.

It can be written as a sum of positive squares in 4 ways, for example, as 6194319616 + 14500013056 = 78704^2 + 120416^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20694332677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924104 + ... + 946232.

Almost surely, 2^20694332672 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 20694332672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22322840820).

20694332672 is an abundant number, since it is smaller than the sum of its proper divisors (23951348968).

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

20694332672 is a wasteful number, since it uses less digits than its factorization.

20694332672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22439 (or 22425 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 20694332672 in words is "twenty billion, six hundred ninety-four million, three hundred thirty-two thousand, six hundred seventy-two".