20689708 has 48 divisors (see below), whose sum is σ = 42085120. Its totient is φ = 8817984.

The previous prime is 20689703. The next prime is 20689709. The reversal of 20689708 is 80798602.

It is not an unprimeable number, because it can be changed into a prime (20689703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42241 + ... + 42727.

Almost surely, 2^20689708 is an apocalyptic number.

It is an amenable number.

20689708 is an abundant number, since it is smaller than the sum of its proper divisors (21395412).

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

20689708 is a wasteful number, since it uses less digits than its factorization.

20689708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 20689708 is about 4548.5940685007. The cubic root of 20689708 is about 274.5268248719.

The spelling of 20689708 in words is "twenty million, six hundred eighty-nine thousand, seven hundred eight".