20043215549 has 4 divisors (see below), whose sum is σ = 22906532064. Its totient is φ = 17179899036.

The previous prime is 20043215461. The next prime is 20043215627. The reversal of 20043215549 is 94551234002.

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-20043215549 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 (20043215249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431658247 + ... + 1431658260.

It is an arithmetic number, because the mean of its divisors is an integer number (5726633016).

Almost surely, 2^20043215549 is an apocalyptic number.

It is an amenable number.

20043215549 is a deficient number, since it is larger than the sum of its proper divisors (2863316515).

20043215549 is an equidigital number, since it uses as much as digits as its factorization.

20043215549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863316514.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20043215549 in words is "twenty billion, forty-three million, two hundred fifteen thousand, five hundred forty-nine".