20047642549 has 8 divisors (see below), whose sum is σ = 22461241248. Its totient is φ = 17732558160.

The previous prime is 20047642529. The next prime is 20047642553. The reversal of 20047642549 is 94524674002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20047642549 - 2¹⁹ = 20047118261 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 (20047642529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24628147 + ... + 24628960.

It is an arithmetic number, because the mean of its divisors is an integer number (2807655156).

Almost surely, 2^20047642549 is an apocalyptic number.

It is an amenable number.

20047642549 is a deficient number, since it is larger than the sum of its proper divisors (2413598699).

20047642549 is a wasteful number, since it uses less digits than its factorization.

20047642549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49257155.

The product of its (nonzero) digits is 483840, while the sum is 43.

It can be divided in two parts, 20047 and 642549, that added together give a square (662596 = 814²).

The spelling of 20047642549 in words is "twenty billion, forty-seven million, six hundred forty-two thousand, five hundred forty-nine".