20617616 has 20 divisors (see below), whose sum is σ = 40323312. Its totient is φ = 10211616.

The previous prime is 20617607. The next prime is 20617627. The reversal of 20617616 is 61671602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4310 + ... + 7733.

Almost surely, 2^20617616 is an apocalyptic number.

It is an amenable number.

20617616 is a deficient number, since it is larger than the sum of its proper divisors (19705696).

20617616 is a wasteful number, since it uses less digits than its factorization.

20617616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12158 (or 12152 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20617616 is about 4540.6625067274. The cubic root of 20617616 is about 274.2075965948.

The spelling of 20617616 in words is "twenty million, six hundred seventeen thousand, six hundred sixteen".