20403400304 has 20 divisors (see below), whose sum is σ = 45178958064. Its totient is φ = 8744314368.

The previous prime is 20403400279. The next prime is 20403400307. The reversal of 20403400304 is 40300430402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403400307) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 91086497 + ... + 91086720.

Almost surely, 2^20403400304 is an apocalyptic number.

It is an amenable number.

20403400304 is an abundant number, since it is smaller than the sum of its proper divisors (24775557760).

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

20403400304 is a wasteful number, since it uses less digits than its factorization.

20403400304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182173232 (or 182173226 counting only the distinct ones).

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

Adding to 20403400304 its reverse (40300430402), we get a palindrome (60703830706).

The spelling of 20403400304 in words is "twenty billion, four hundred three million, four hundred thousand, three hundred four".