20656606 has 4 divisors (see below), whose sum is σ = 30984912. Its totient is φ = 10328302.

The previous prime is 20656589. The next prime is 20656627. The reversal of 20656606 is 60665602.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5164150 + ... + 5164153.

It is an arithmetic number, because the mean of its divisors is an integer number (7746228).

Almost surely, 2^20656606 is an apocalyptic number.

20656606 is a deficient number, since it is larger than the sum of its proper divisors (10328306).

20656606 is a wasteful number, since it uses less digits than its factorization.

20656606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10328305.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20656606 is about 4544.9539051568. The cubic root of 20656606 is about 274.3803391949.

The spelling of 20656606 in words is "twenty million, six hundred fifty-six thousand, six hundred six".