20656607 has 4 divisors (see below), whose sum is σ = 20676600. Its totient is φ = 20636616.

The previous prime is 20656589. The next prime is 20656627. The reversal of 20656607 is 70665602.

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 20656607 - 2¹⁶ = 20591071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656627) 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, 8357 + ... + 10542.

It is an arithmetic number, because the mean of its divisors is an integer number (5169150).

Almost surely, 2^20656607 is an apocalyptic number.

20656607 is a deficient number, since it is larger than the sum of its proper divisors (19993).

20656607 is a wasteful number, since it uses less digits than its factorization.

20656607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19992.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20656607 is about 4544.9540151689. The cubic root of 20656607 is about 274.3803436225.

The spelling of 20656607 in words is "twenty million, six hundred fifty-six thousand, six hundred seven".