20668008 has 16 divisors (see below), whose sum is σ = 51670080. Its totient is φ = 6889328.

The previous prime is 20667973. The next prime is 20668027. The reversal of 20668008 is 80086602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430560 + ... + 430607.

It is an arithmetic number, because the mean of its divisors is an integer number (3229380).

Almost surely, 2^20668008 is an apocalyptic number.

It is an amenable number.

20668008 is an abundant number, since it is smaller than the sum of its proper divisors (31002072).

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

20668008 is a wasteful number, since it uses less digits than its factorization.

20668008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861176 (or 861172 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20668008 is about 4546.2080902660. The cubic root of 20668008 is about 274.4308139144.

The spelling of 20668008 in words is "twenty million, six hundred sixty-eight thousand, eight".