20443013 has 4 divisors (see below), whose sum is σ = 20507820. Its totient is φ = 20378208.

The previous prime is 20443009. The next prime is 20443019. The reversal of 20443013 is 31034402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5987809 + 14455204 = 2447^2 + 3802^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443013 - 2² = 20443009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20442982 and 20443000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443019) 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, 31928 + ... + 32561.

It is an arithmetic number, because the mean of its divisors is an integer number (5126955).

Almost surely, 2^20443013 is an apocalyptic number.

It is an amenable number.

20443013 is a deficient number, since it is larger than the sum of its proper divisors (64807).

20443013 is an equidigital number, since it uses as much as digits as its factorization.

20443013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64806.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20443013 is about 4521.3950280859. The cubic root of 20443013 is about 273.4313467981.

Adding to 20443013 its reverse (31034402), we get a palindrome (51477415).

The spelling of 20443013 in words is "twenty million, four hundred forty-three thousand, thirteen".