20686667 has 8 divisors (see below), whose sum is σ = 21072240. Its totient is φ = 20304000.

The previous prime is 20686661. The next prime is 20686681. The reversal of 20686667 is 76668602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20686667 - 2⁸ = 20686411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20686661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17759 + ... + 18887.

It is an arithmetic number, because the mean of its divisors is an integer number (2634030).

Almost surely, 2^20686667 is an apocalyptic number.

20686667 is a deficient number, since it is larger than the sum of its proper divisors (385573).

20686667 is a wasteful number, since it uses less digits than its factorization.

20686667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 20686667 is about 4548.2597771016. The cubic root of 20686667 is about 274.5133741105.

The spelling of 20686667 in words is "twenty million, six hundred eighty-six thousand, six hundred sixty-seven".