20436043 has 4 divisors (see below), whose sum is σ = 20466648. Its totient is φ = 20405440.

The previous prime is 20436041. The next prime is 20436047. The reversal of 20436043 is 34063402.

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 20436043 - 2¹ = 20436041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20436041) 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, 14278 + ... + 15643.

It is an arithmetic number, because the mean of its divisors is an integer number (5116662).

Almost surely, 2^20436043 is an apocalyptic number.

20436043 is a deficient number, since it is larger than the sum of its proper divisors (30605).

20436043 is an equidigital number, since it uses as much as digits as its factorization.

20436043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30604.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 20436043 is about 4520.6241825659. The cubic root of 20436043 is about 273.4002679951.

Adding to 20436043 its reverse (34063402), we get a palindrome (54499445).

The spelling of 20436043 in words is "twenty million, four hundred thirty-six thousand, forty-three".