20550616 has 8 divisors (see below), whose sum is σ = 38532420. Its totient is φ = 10275304.

The previous prime is 20550599. The next prime is 20550617. The reversal of 20550616 is 61605502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550617) by changing a digit.

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, 1284406 + ... + 1284421.

Almost surely, 2^20550616 is an apocalyptic number.

It is an amenable number.

20550616 is a deficient number, since it is larger than the sum of its proper divisors (17981804).

20550616 is a wasteful number, since it uses less digits than its factorization.

20550616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568833 (or 2568829 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20550616 is about 4533.2787251613. The cubic root of 20550616 is about 273.9102481894.

The spelling of 20550616 in words is "twenty million, five hundred fifty thousand, six hundred sixteen".