20512043 has 4 divisors (see below), whose sum is σ = 20848368. Its totient is φ = 20175720.

The previous prime is 20512031. The next prime is 20512073. The reversal of 20512043 is 34021502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20512043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512073) 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, 168071 + ... + 168192.

It is an arithmetic number, because the mean of its divisors is an integer number (5212092).

Almost surely, 2^20512043 is an apocalyptic number.

20512043 is a deficient number, since it is larger than the sum of its proper divisors (336325).

20512043 is an equidigital number, since it uses as much as digits as its factorization.

20512043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336324.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20512043 is about 4529.0223006737. The cubic root of 20512043 is about 273.7387665928.

Adding to 20512043 its reverse (34021502), we get a palindrome (54533545).

The spelling of 20512043 in words is "twenty million, five hundred twelve thousand, forty-three".