20320004032 has 56 divisors (see below), whose sum is σ = 41071190400. Its totient is φ = 9971909376.

The previous prime is 20320004021. The next prime is 20320004041. The reversal of 20320004032 is 23040002302.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20320003997 and 20320004015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575069 + ... + 2582947.

Almost surely, 2^20320004032 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 20320004032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20535595200).

20320004032 is an abundant number, since it is smaller than the sum of its proper divisors (20751186368).

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

20320004032 is an equidigital number, since it uses as much as digits as its factorization.

20320004032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8633 (or 8623 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

Adding to 20320004032 its reverse (23040002302), we get a palindrome (43360006334).

The spelling of 20320004032 in words is "twenty billion, three hundred twenty million, four thousand, thirty-two".