20668607 has 4 divisors (see below), whose sum is σ = 21227256. Its totient is φ = 20109960.

The previous prime is 20668589. The next prime is 20668631. The reversal of 20668607 is 70686602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20668607 - 2²⁰ = 19620031 is a prime.

It is a super-3 number, since 3×20668607³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668657) 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, 279269 + ... + 279342.

It is an arithmetic number, because the mean of its divisors is an integer number (5306814).

Almost surely, 2^20668607 is an apocalyptic number.

20668607 is a deficient number, since it is larger than the sum of its proper divisors (558649).

20668607 is an equidigital number, since it uses as much as digits as its factorization.

20668607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558648.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20668607 is about 4546.2739688673. The cubic root of 20668607 is about 274.4334650725.

The spelling of 20668607 in words is "twenty million, six hundred sixty-eight thousand, six hundred seven".