20555143 has 8 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 17547000.

The previous prime is 20555141. The next prime is 20555147. The reversal of 20555143 is 34155502.

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 20555143 - 2¹ = 20555141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555141) 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, 4093 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^20555143 is an apocalyptic number.

20555143 is a deficient number, since it is larger than the sum of its proper divisors (3032057).

20555143 is a wasteful number, since it uses less digits than its factorization.

20555143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20555143 is about 4533.7780051520. The cubic root of 20555143 is about 273.9303595193.

The spelling of 20555143 in words is "twenty million, five hundred fifty-five thousand, one hundred forty-three".