20043449 has 4 divisors (see below), whose sum is σ = 20115060. Its totient is φ = 19971840.

The previous prime is 20043433. The next prime is 20043451. The reversal of 20043449 is 94434002.

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 5359225 + 14684224 = 2315^2 + 3832^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043449 - 2⁴ = 20043433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043409) 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, 35384 + ... + 35945.

It is an arithmetic number, because the mean of its divisors is an integer number (5028765).

Almost surely, 2^20043449 is an apocalyptic number.

It is an amenable number.

20043449 is a deficient number, since it is larger than the sum of its proper divisors (71611).

20043449 is an equidigital number, since it uses as much as digits as its factorization.

20043449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71610.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20043449 is about 4476.9910654367. The cubic root of 20043449 is about 271.6381840405.

The spelling of 20043449 in words is "twenty million, forty-three thousand, four hundred forty-nine".