20681745208 has 32 divisors (see below), whose sum is σ = 38918169360. Its totient is φ = 10303637760.

The previous prime is 20681745181. The next prime is 20681745209. The reversal of 20681745208 is 80254718602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681745209) 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, 2676166 + ... + 2683882.

Almost surely, 2^20681745208 is an apocalyptic number.

It is an amenable number.

20681745208 is a deficient number, since it is larger than the sum of its proper divisors (18236424152).

20681745208 is a wasteful number, since it uses less digits than its factorization.

20681745208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8887 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 20681745208 in words is "twenty billion, six hundred eighty-one million, seven hundred forty-five thousand, two hundred eight".