20556167 has 8 divisors (see below), whose sum is σ = 20802912. Its totient is φ = 20311200.

The previous prime is 20556161. The next prime is 20556191. The reversal of 20556167 is 76165502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20556167 - 2⁸ = 20555911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556161) 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 7 ways as a sum of consecutive naturals, for example, 48617 + ... + 49037.

It is an arithmetic number, because the mean of its divisors is an integer number (2600364).

Almost surely, 2^20556167 is an apocalyptic number.

20556167 is a deficient number, since it is larger than the sum of its proper divisors (246745).

20556167 is a wasteful number, since it uses less digits than its factorization.

20556167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20556167 is about 4533.8909338448. The cubic root of 20556167 is about 273.9349082597.

The spelling of 20556167 in words is "twenty million, five hundred fifty-six thousand, one hundred sixty-seven".