20403304040 has 96 divisors (see below), whose sum is σ = 53787434400. Its totient is φ = 6944999040.

The previous prime is 20403304039. The next prime is 20403304079. The reversal of 20403304040 is 4040330402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234995 + ... + 309885.

It is an arithmetic number, because the mean of its divisors is an integer number (560285775).

Almost surely, 2^20403304040 is an apocalyptic number.

20403304040 is a gapful number since it is divisible by the number (20) 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 20403304040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26893717200).

20403304040 is an abundant number, since it is smaller than the sum of its proper divisors (33384130360).

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

20403304040 is a wasteful number, since it uses less digits than its factorization.

20403304040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75055 (or 75044 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 20403304040 its reverse (4040330402), we get a palindrome (24443634442).

The spelling of 20403304040 in words is "twenty billion, four hundred three million, three hundred four thousand, forty".