20043332549 has 4 divisors (see below), whose sum is σ = 20088577536. Its totient is φ = 19998087564.

The previous prime is 20043332531. The next prime is 20043332581. The reversal of 20043332549 is 94523334002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043332549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20043332509) 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, 22621829 + ... + 22622714.

It is an arithmetic number, because the mean of its divisors is an integer number (5022144384).

Almost surely, 2^20043332549 is an apocalyptic number.

It is an amenable number.

20043332549 is a deficient number, since it is larger than the sum of its proper divisors (45244987).

20043332549 is an equidigital number, since it uses as much as digits as its factorization.

20043332549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45244986.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 20043332549 in words is "twenty billion, forty-three million, three hundred thirty-two thousand, five hundred forty-nine".