20985008 has 20 divisors (see below), whose sum is σ = 44355048. Its totient is φ = 9538560.

The previous prime is 20985001. The next prime is 20985017. The reversal of 20985008 is 80058902.

It is not an unprimeable number, because it can be changed into a prime (20985001) 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, 59441 + ... + 59792.

Almost surely, 2^20985008 is an apocalyptic number.

It is an amenable number.

20985008 is an abundant number, since it is smaller than the sum of its proper divisors (23370040).

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

20985008 is a wasteful number, since it uses less digits than its factorization.

20985008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119252 (or 119246 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 20985008 is about 4580.9396416019. The cubic root of 20985008 is about 275.8267483715.

The spelling of 20985008 in words is "twenty million, nine hundred eighty-five thousand, eight".