20656616 has 8 divisors (see below), whose sum is σ = 38731170. Its totient is φ = 10328304.

The previous prime is 20656589. The next prime is 20656627. The reversal of 20656616 is 61665602.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 1768900 = 4346^2 + 1330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291031 + ... + 1291046.

Almost surely, 2^20656616 is an apocalyptic number.

It is an amenable number.

20656616 is a deficient number, since it is larger than the sum of its proper divisors (18074554).

20656616 is a wasteful number, since it uses less digits than its factorization.

20656616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582083 (or 2582079 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20656616 is about 4544.9550052778. The cubic root of 20656616 is about 274.3803834713.

The spelling of 20656616 in words is "twenty million, six hundred fifty-six thousand, six hundred sixteen".