20530143 has 6 divisors (see below), whose sum is σ = 29654664. Its totient is φ = 13686756.

The previous prime is 20530129. The next prime is 20530151. The reversal of 20530143 is 34103502.

It is not a de Polignac number, because 20530143 - 2¹² = 20526047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140555 + ... + 1140572.

It is an arithmetic number, because the mean of its divisors is an integer number (4942444).

Almost surely, 2^20530143 is an apocalyptic number.

20530143 is a deficient number, since it is larger than the sum of its proper divisors (9124521).

20530143 is a wasteful number, since it uses less digits than its factorization.

20530143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281133 (or 2281130 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20530143 is about 4531.0200838222. The cubic root of 20530143 is about 273.8192593882.

Adding to 20530143 its reverse (34103502), we get a palindrome (54633645).

The spelling of 20530143 in words is "twenty million, five hundred thirty thousand, one hundred forty-three".