20001443 has 16 divisors (see below), whose sum is σ = 25315584. Its totient is φ = 15348960.

The previous prime is 20001439. The next prime is 20001451. The reversal of 20001443 is 34410002.

It is not a de Polignac number, because 20001443 - 2² = 20001439 is a prime.

20001443 is a modest number, since divided by 1443 gives 20 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20000443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3221 + ... + 7097.

It is an arithmetic number, because the mean of its divisors is an integer number (1582224).

Almost surely, 2^20001443 is an apocalyptic number.

20001443 is a deficient number, since it is larger than the sum of its proper divisors (5314141).

20001443 is a wasteful number, since it uses less digits than its factorization.

20001443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20001443 is about 4472.2972843942. The cubic root of 20001443 is about 271.4482896769.

Adding to 20001443 its reverse (34410002), we get a palindrome (54411445).

It can be divided in two parts, 2000 and 1443, that added together give a palindrome (3443).

The spelling of 20001443 in words is "twenty million, one thousand, four hundred forty-three".