20685608 has 16 divisors (see below), whose sum is σ = 39171060. Its totient is φ = 10240000.

The previous prime is 20685601. The next prime is 20685629. The reversal of 20685608 is 80658602.

It can be written as a sum of positive squares in 2 ways, for example, as 12517444 + 8168164 = 3538^2 + 2858^2 .

It is not an unprimeable number, because it can be changed into a prime (20685601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11993 + ... + 13608.

Almost surely, 2^20685608 is an apocalyptic number.

It is an amenable number.

20685608 is a deficient number, since it is larger than the sum of its proper divisors (18485452).

20685608 is a wasteful number, since it uses less digits than its factorization.

20685608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25708 (or 25704 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 20685608 is about 4548.1433574592. The cubic root of 20685608 is about 274.5086896983.

The spelling of 20685608 in words is "twenty million, six hundred eighty-five thousand, six hundred eight".