20555166 has 16 divisors (see below), whose sum is σ = 41192064. Its totient is φ = 6838104.

The previous prime is 20555147. The next prime is 20555167. The reversal of 20555166 is 66155502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (2574504).

Almost surely, 2^20555166 is an apocalyptic number.

20555166 is an abundant number, since it is smaller than the sum of its proper divisors (20636898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20555166 is a wasteful number, since it uses less digits than its factorization.

20555166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 20555166 is about 4533.7805416672. The cubic root of 20555166 is about 273.9304616899.

The spelling of 20555166 in words is "twenty million, five hundred fifty-five thousand, one hundred sixty-six".