20538143 has 2 divisors, whose sum is σ = 20538144. Its totient is φ = 20538142.

The previous prime is 20538137. The next prime is 20538157. The reversal of 20538143 is 34183502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20538143 - 2⁴ = 20538127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269071 + 10269072.

It is an arithmetic number, because the mean of its divisors is an integer number (10269072).

Almost surely, 2^20538143 is an apocalyptic number.

20538143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538143 is an equidigital number, since it uses as much as digits as its factorization.

20538143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20538143 is about 4531.9028012525. The cubic root of 20538143 is about 273.8548212383.

The spelling of 20538143 in words is "twenty million, five hundred thirty-eight thousand, one hundred forty-three".