20142443 has 4 divisors (see below), whose sum is σ = 20837040. Its totient is φ = 19447848.

The previous prime is 20142427. The next prime is 20142481. The reversal of 20142443 is 34424102.

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 20142443 - 2⁴ = 20142427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20132443) 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, 347255 + ... + 347312.

It is an arithmetic number, because the mean of its divisors is an integer number (5209260).

Almost surely, 2^20142443 is an apocalyptic number.

20142443 is a deficient number, since it is larger than the sum of its proper divisors (694597).

20142443 is an equidigital number, since it uses as much as digits as its factorization.

20142443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694596.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20142443 is about 4488.0333109281. The cubic root of 20142443 is about 272.0846541220.

Adding to 20142443 its reverse (34424102), we get a palindrome (54566545).

The spelling of 20142443 in words is "twenty million, one hundred forty-two thousand, four hundred forty-three".