20881443 has 16 divisors (see below), whose sum is σ = 30506112. Its totient is φ = 12600000.

The previous prime is 20881439. The next prime is 20881451. The reversal of 20881443 is 34418802.

It is not a de Polignac number, because 20881443 - 2² = 20881439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20881443.

It is not an unprimeable number, because it can be changed into a prime (20881433) 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, 7023 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (1906632).

Almost surely, 2^20881443 is an apocalyptic number.

20881443 is a deficient number, since it is larger than the sum of its proper divisors (9624669).

20881443 is a wasteful number, since it uses less digits than its factorization.

20881443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20881443 is about 4569.6217567759. The cubic root of 20881443 is about 275.3722474037.

The spelling of 20881443 in words is "twenty million, eight hundred eighty-one thousand, four hundred forty-three".