20667868 has 12 divisors (see below), whose sum is σ = 38951080. Its totient is φ = 9538992.

The previous prime is 20667841. The next prime is 20667893. The reversal of 20667868 is 86876602.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 198678 + ... + 198781.

Almost surely, 2^20667868 is an apocalyptic number.

It is an amenable number.

20667868 is a deficient number, since it is larger than the sum of its proper divisors (18283212).

20667868 is a wasteful number, since it uses less digits than its factorization.

20667868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397476 (or 397474 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 20667868 is about 4546.1926927925. The cubic root of 20667868 is about 274.4301942708.

The spelling of 20667868 in words is "twenty million, six hundred sixty-seven thousand, eight hundred sixty-eight".