20786668 has 12 divisors (see below), whose sum is σ = 41573392. Its totient is φ = 8908560.

The previous prime is 20786651. The next prime is 20786669. The reversal of 20786668 is 86668702.

20786668 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20786669) 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, 371163 + ... + 371218.

Almost surely, 2^20786668 is an apocalyptic number.

20786668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20786668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20786668 is a wasteful number, since it uses less digits than its factorization.

20786668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742392 (or 742390 counting only the distinct ones).

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

The square root of 20786668 is about 4559.2398489222. The cubic root of 20786668 is about 274.9550031061.

The spelling of 20786668 in words is "twenty million, seven hundred eighty-six thousand, six hundred sixty-eight".