20423733649 has 8 divisors (see below), whose sum is σ = 23591050848. Its totient is φ = 17474852160.

The previous prime is 20423733647. The next prime is 20423733667. The reversal of 20423733649 is 94633732402.

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

It is not a de Polignac number, because 20423733649 - 2¹ = 20423733647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423733641) 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, 54608727 + ... + 54609100.

It is an arithmetic number, because the mean of its divisors is an integer number (2948881356).

Almost surely, 2^20423733649 is an apocalyptic number.

It is an amenable number.

20423733649 is a deficient number, since it is larger than the sum of its proper divisors (3167317199).

20423733649 is a wasteful number, since it uses less digits than its factorization.

20423733649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109217855.

The product of its (nonzero) digits is 653184, while the sum is 43.

The spelling of 20423733649 in words is "twenty billion, four hundred twenty-three million, seven hundred thirty-three thousand, six hundred forty-nine".