20115143 has 4 divisors (see below), whose sum is σ = 20494728. Its totient is φ = 19735560.

The previous prime is 20115127. The next prime is 20115191. The reversal of 20115143 is 34151102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34151102 = 2 ⋅17075551.

It is a cyclic number.

It is not a de Polignac number, because 20115143 - 2⁴ = 20115127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115113) 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, 189713 + ... + 189818.

It is an arithmetic number, because the mean of its divisors is an integer number (5123682).

Almost surely, 2^20115143 is an apocalyptic number.

20115143 is a deficient number, since it is larger than the sum of its proper divisors (379585).

20115143 is an equidigital number, since it uses as much as digits as its factorization.

20115143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379584.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20115143 is about 4484.9908584076. The cubic root of 20115143 is about 271.9616755044.

Adding to 20115143 its reverse (34151102), we get a palindrome (54266245).

The spelling of 20115143 in words is "twenty million, one hundred fifteen thousand, one hundred forty-three".