20685342976 has 81 divisors (see below), whose sum is σ = 42176577163. Its totient is φ = 10125209600.

The previous prime is 20685342971. The next prime is 20685342983. The reversal of 20685342976 is 67924358602.

The square root of 20685342976 is 143824.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1308702976 + 19376640000 = 36176^2 + 139200^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20685342971) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 204805326 + ... + 204805426.

Almost surely, 2^20685342976 is an apocalyptic number.

20685342976 is the 143824-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20685342976

20685342976 is an abundant number, since it is smaller than the sum of its proper divisors (21491234187).

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

20685342976 is an frugal number, since it uses more digits than its factorization.

20685342976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 20685342976 in words is "twenty billion, six hundred eighty-five million, three hundred forty-two thousand, nine hundred seventy-six".