20554163 has 4 divisors (see below), whose sum is σ = 23490480. Its totient is φ = 17617848.

The previous prime is 20554159. The next prime is 20554187. The reversal of 20554163 is 36145502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20554163 - 2² = 20554159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20554123) 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 3 ways as a sum of consecutive naturals, for example, 1468148 + ... + 1468161.

It is an arithmetic number, because the mean of its divisors is an integer number (5872620).

Almost surely, 2^20554163 is an apocalyptic number.

20554163 is a deficient number, since it is larger than the sum of its proper divisors (2936317).

20554163 is an equidigital number, since it uses as much as digits as its factorization.

20554163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936316.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20554163 is about 4533.6699262297. The cubic root of 20554163 is about 273.9260060910.

Adding to 20554163 its reverse (36145502), we get a palindrome (56699665).

The spelling of 20554163 in words is "twenty million, five hundred fifty-four thousand, one hundred sixty-three".