20744289047 has 4 divisors (see below), whose sum is σ = 20745783840. Its totient is φ = 20742794256.

The previous prime is 20744289043. The next prime is 20744289089. The reversal of 20744289047 is 74098244702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20744289047 - 2² = 20744289043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20744288992 and 20744289010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20744289043) 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, 726383 + ... + 754400.

It is an arithmetic number, because the mean of its divisors is an integer number (5186445960).

Almost surely, 2^20744289047 is an apocalyptic number.

20744289047 is a deficient number, since it is larger than the sum of its proper divisors (1494793).

20744289047 is a wasteful number, since it uses less digits than its factorization.

20744289047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494792.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 20744289047 in words is "twenty billion, seven hundred forty-four million, two hundred eighty-nine thousand, forty-seven".