20400332344 has 64 divisors (see below), whose sum is σ = 45360230400. Its totient is φ = 8415792000.

The previous prime is 20400332341. The next prime is 20400332363. The reversal of 20400332344 is 44323300402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400332341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518569 + ... + 556519.

It is an arithmetic number, because the mean of its divisors is an integer number (708753600).

Almost surely, 2^20400332344 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 20400332344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22680115200).

20400332344 is an abundant number, since it is smaller than the sum of its proper divisors (24959898056).

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

20400332344 is a wasteful number, since it uses less digits than its factorization.

20400332344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38324 (or 38320 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 20400332344 its reverse (44323300402), we get a palindrome (64723632746).

The spelling of 20400332344 in words is "twenty billion, four hundred million, three hundred thirty-two thousand, three hundred forty-four".