20043131 has 4 divisors (see below), whose sum is σ = 20196264. Its totient is φ = 19890000.

The previous prime is 20043083. The next prime is 20043151. The reversal of 20043131 is 13134002.

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 20043131 - 2¹⁰ = 20042107 is a prime.

It is a super-2 number, since 2×20043131² = 803454200566322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043151) 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, 76370 + ... + 76631.

It is an arithmetic number, because the mean of its divisors is an integer number (5049066).

Almost surely, 2^20043131 is an apocalyptic number.

20043131 is a deficient number, since it is larger than the sum of its proper divisors (153133).

20043131 is a wasteful number, since it uses less digits than its factorization.

20043131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153132.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20043131 is about 4476.9555503713. The cubic root of 20043131 is about 271.6367474714.

Adding to 20043131 its reverse (13134002), we get a palindrome (33177133).

The spelling of 20043131 in words is "twenty million, forty-three thousand, one hundred thirty-one".