20536143 has 4 divisors (see below), whose sum is σ = 27381528. Its totient is φ = 13690760.

The previous prime is 20536123. The next prime is 20536181. The reversal of 20536143 is 34163502.

It is a happy number.

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 20536143 - 2⁸ = 20535887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422688 + ... + 3422693.

It is an arithmetic number, because the mean of its divisors is an integer number (6845382).

Almost surely, 2^20536143 is an apocalyptic number.

20536143 is a deficient number, since it is larger than the sum of its proper divisors (6845385).

20536143 is an equidigital number, since it uses as much as digits as its factorization.

20536143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845384.

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

The square root of 20536143 is about 4531.6821380145. The cubic root of 20536143 is about 273.8459316417.

Adding to 20536143 its reverse (34163502), we get a palindrome (54699645).

The spelling of 20536143 in words is "twenty million, five hundred thirty-six thousand, one hundred forty-three".