20031043 has 4 divisors (see below), whose sum is σ = 20043640. Its totient is φ = 20018448.

The previous prime is 20031041. The next prime is 20031047. The reversal of 20031043 is 34013002.

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 20031043 - 2¹ = 20031041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (5010910).

Almost surely, 2^20031043 is an apocalyptic number.

20031043 is a deficient number, since it is larger than the sum of its proper divisors (12597).

20031043 is a wasteful number, since it uses less digits than its factorization.

20031043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12596.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20031043 is about 4475.6053221883. The cubic root of 20031043 is about 271.5821285045.

Adding to 20031043 its reverse (34013002), we get a palindrome (54044045).

The spelling of 20031043 in words is "twenty million, thirty-one thousand, forty-three".