20556075 has 12 divisors (see below), whose sum is σ = 33986168. Its totient is φ = 10963200.

The previous prime is 20556059. The next prime is 20556079. The reversal of 20556075 is 57065502.

It is not a de Polignac number, because 20556075 - 2⁴ = 20556059 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556079) 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 in 11 ways as a sum of consecutive naturals, for example, 136966 + ... + 137115.

Almost surely, 2^20556075 is an apocalyptic number.

20556075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20556075 is a deficient number, since it is larger than the sum of its proper divisors (13430093).

20556075 is a wasteful number, since it uses less digits than its factorization.

20556075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274094 (or 274089 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 20556075 is about 4533.8807880226. The cubic root of 20556075 is about 273.9344995900.

It can be divided in two parts, 205 and 56075, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 20556075 in words is "twenty million, five hundred fifty-six thousand, seventy-five".