20857680608 has 24 divisors (see below), whose sum is σ = 41124616848. Its totient is φ = 10413333504.

The previous prime is 20857680607. The next prime is 20857680611. The reversal of 20857680608 is 80608675802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857680607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462716 + ... + 505787.

It is an arithmetic number, because the mean of its divisors is an integer number (1713525702).

Almost surely, 2^20857680608 is an apocalyptic number.

It is an amenable number.

20857680608 is a deficient number, since it is larger than the sum of its proper divisors (20266936240).

20857680608 is an equidigital number, since it uses as much as digits as its factorization.

20857680608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969186 (or 969178 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 20857680608 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, six hundred eight".