20055161 has 6 divisors (see below), whose sum is σ = 23329530. Its totient is φ = 17190096.

The previous prime is 20055143. The next prime is 20055173. The reversal of 20055161 is 16155002.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 2119936 = 4235^2 + 1456^2 .

It is not a de Polignac number, because 20055161 - 2⁶ = 20055097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20055131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204596 + ... + 204693.

It is an arithmetic number, because the mean of its divisors is an integer number (3888255).

Almost surely, 2^20055161 is an apocalyptic number.

It is an amenable number.

20055161 is a deficient number, since it is larger than the sum of its proper divisors (3274369).

20055161 is an equidigital number, since it uses as much as digits as its factorization.

20055161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409303 (or 409296 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20055161 is about 4478.2988957862. The cubic root of 20055161 is about 271.6910825702.

The spelling of 20055161 in words is "twenty million, fifty-five thousand, one hundred sixty-one".