20002443 has 4 divisors (see below), whose sum is σ = 26669928. Its totient is φ = 13334960.

The previous prime is 20002429. The next prime is 20002453. The reversal of 20002443 is 34420002.

It is a happy number.

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 20002443 - 2⁸ = 20002187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20002453) 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, 3333738 + ... + 3333743.

It is an arithmetic number, because the mean of its divisors is an integer number (6667482).

Almost surely, 2^20002443 is an apocalyptic number.

20002443 is a deficient number, since it is larger than the sum of its proper divisors (6667485).

20002443 is an equidigital number, since it uses as much as digits as its factorization.

20002443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667484.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20002443 is about 4472.4090823627. The cubic root of 20002443 is about 271.4528134132.

Adding to 20002443 its reverse (34420002), we get a palindrome (54422445).

The spelling of 20002443 in words is "twenty million, two thousand, four hundred forty-three".