20857680610 has 16 divisors (see below), whose sum is σ = 40431811896. Its totient is φ = 7701297408.

The previous prime is 20857680607. The next prime is 20857680611. The reversal of 20857680610 is 1608675802.

It can be written as a sum of positive squares in 4 ways, for example, as 18950000281 + 1907680329 = 137659^2 + 43677^2 .

It is not an unprimeable number, because it can be changed into a prime (20857680611) 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, 80221719 + ... + 80221978.

Almost surely, 2^20857680610 is an apocalyptic number.

20857680610 is a deficient number, since it is larger than the sum of its proper divisors (19574131286).

20857680610 is a wasteful number, since it uses less digits than its factorization.

20857680610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160443717.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 20857680610 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, six hundred ten".