20444533647 has 8 divisors (see below), whose sum is σ = 27283024944. Its totient is φ = 13617865728.

The previous prime is 20444533643. The next prime is 20444533667. The reversal of 20444533647 is 74633544402.

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

It is not a de Polignac number, because 20444533647 - 2² = 20444533643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20444533599 and 20444533608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444533643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2951808 + ... + 2958725.

It is an arithmetic number, because the mean of its divisors is an integer number (3410378118).

Almost surely, 2^20444533647 is an apocalyptic number.

20444533647 is a deficient number, since it is larger than the sum of its proper divisors (6838491297).

20444533647 is a wasteful number, since it uses less digits than its factorization.

20444533647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911689.

The product of its (nonzero) digits is 967680, while the sum is 42.

The spelling of 20444533647 in words is "twenty billion, four hundred forty-four million, five hundred thirty-three thousand, six hundred forty-seven".