20404421324 has 12 divisors (see below), whose sum is σ = 40808842704. Its totient is φ = 8744751984.

The previous prime is 20404421299. The next prime is 20404421327. The reversal of 20404421324 is 42312440402.

It is a happy number.

20404421324 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20404421293 and 20404421302.

It is not an unprimeable number, because it can be changed into a prime (20404421327) 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, 364364639 + ... + 364364694.

It is an arithmetic number, because the mean of its divisors is an integer number (3400736892).

Almost surely, 2^20404421324 is an apocalyptic number.

It is an amenable number.

20404421324 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20404421324 is a wasteful number, since it uses less digits than its factorization.

20404421324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728729344 (or 728729342 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20404421324 its reverse (42312440402), we get a palindrome (62716861726).

The spelling of 20404421324 in words is "twenty billion, four hundred four million, four hundred twenty-one thousand, three hundred twenty-four".