20423442304 has 64 divisors (see below), whose sum is σ = 43637130000. Its totient is φ = 9491668992.

The previous prime is 20423442293. The next prime is 20423442341. The reversal of 20423442304 is 40324432402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49672 + ... + 208120.

Almost surely, 2^20423442304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20423442304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21818565000).

20423442304 is an abundant number, since it is smaller than the sum of its proper divisors (23213687696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423442304 is a wasteful number, since it uses less digits than its factorization.

20423442304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158535 (or 158523 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20423442304 its reverse (40324432402), we get a palindrome (60747874706).

The spelling of 20423442304 in words is "twenty billion, four hundred twenty-three million, four hundred forty-two thousand, three hundred four".