20690668 has 12 divisors (see below), whose sum is σ = 36242752. Its totient is φ = 10335600.

The previous prime is 20690647. The next prime is 20690687. The reversal of 20690668 is 86609602.

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, 4618 + ... + 7918.

Almost surely, 2^20690668 is an apocalyptic number.

It is an amenable number.

20690668 is a deficient number, since it is larger than the sum of its proper divisors (15552084).

20690668 is a wasteful number, since it uses less digits than its factorization.

20690668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872 (or 4870 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20690668 is about 4548.6995943896. The cubic root of 20690668 is about 274.5310708103.

The spelling of 20690668 in words is "twenty million, six hundred ninety thousand, six hundred sixty-eight".