20563143 has 8 divisors (see below), whose sum is σ = 27474048. Its totient is φ = 13680504.

The previous prime is 20563141. The next prime is 20563163. The reversal of 20563143 is 34136502.

It is a happy number.

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

It is not a de Polignac number, because 20563143 - 2¹ = 20563141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563141) 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, 5305 + ... + 8322.

It is an arithmetic number, because the mean of its divisors is an integer number (3434256).

Almost surely, 2^20563143 is an apocalyptic number.

20563143 is a deficient number, since it is larger than the sum of its proper divisors (6910905).

20563143 is a wasteful number, since it uses less digits than its factorization.

20563143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14133.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20563143 is about 4534.6601857251. The cubic root of 20563143 is about 273.9658925346.

Adding to 20563143 its reverse (34136502), we get a palindrome (54699645).

It can be divided in two parts, 20563 and 143, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20563143 in words is "twenty million, five hundred sixty-three thousand, one hundred forty-three".