20556365 has 16 divisors (see below), whose sum is σ = 26345088. Its totient is φ = 15360576.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556365 is 56365502.

It is a cyclic number.

It is not a de Polignac number, because 20556365 - 2⁶ = 20556301 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 2867 + ... + 7023.

It is an arithmetic number, because the mean of its divisors is an integer number (1646568).

Almost surely, 2^20556365 is an apocalyptic number.

It is an amenable number.

20556365 is a deficient number, since it is larger than the sum of its proper divisors (5788723).

20556365 is a wasteful number, since it uses less digits than its factorization.

20556365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 20556365 is about 4533.9127693417. The cubic root of 20556365 is about 273.9357877839.

The spelling of 20556365 in words is "twenty million, five hundred fifty-six thousand, three hundred sixty-five".