20923343064 has 512 divisors, whose sum is σ = 68395622400. Its totient is φ = 5875752960.

The previous prime is 20923343033. The next prime is 20923343071. The reversal of 20923343064 is 46034332902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 185162272 + ... + 185162384.

It is an arithmetic number, because the mean of its divisors is an integer number (133585200).

Almost surely, 2^20923343064 is an apocalyptic number.

20923343064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20923343064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34197811200).

20923343064 is an abundant number, since it is smaller than the sum of its proper divisors (47472279336).

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

20923343064 is a wasteful number, since it uses less digits than its factorization.

20923343064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

Adding to 20923343064 its reverse (46034332902), we get a palindrome (66957675966).

The spelling of 20923343064 in words is "twenty billion, nine hundred twenty-three million, three hundred forty-three thousand, sixty-four".