20421324404 has 24 divisors (see below), whose sum is σ = 38611735008. Its totient is φ = 9394518240.

The previous prime is 20421324401. The next prime is 20421324499. The reversal of 20421324404 is 40442312402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421324401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623642 + ... + 655569.

It is an arithmetic number, because the mean of its divisors is an integer number (1608822292).

Almost surely, 2^20421324404 is an apocalyptic number.

It is an amenable number.

20421324404 is a deficient number, since it is larger than the sum of its proper divisors (18190410604).

20421324404 is a wasteful number, since it uses less digits than its factorization.

20421324404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279535 (or 1279533 counting only the distinct ones).

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

Adding to 20421324404 its reverse (40442312402), we get a palindrome (60863636806).

The spelling of 20421324404 in words is "twenty billion, four hundred twenty-one million, three hundred twenty-four thousand, four hundred four".