20421404344 has 32 divisors (see below), whose sum is σ = 41816185200. Its totient is φ = 9272427520.

The previous prime is 20421404303. The next prime is 20421404363. The reversal of 20421404344 is 44340412402.

It is a super-2 number, since 2×20421404344² (a number of 21 digits) contains 22 as substring.

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, 43147 + ... + 206650.

Almost surely, 2^20421404344 is an apocalyptic number.

It is an amenable number.

20421404344 is an abundant number, since it is smaller than the sum of its proper divisors (21394780856).

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

20421404344 is a wasteful number, since it uses less digits than its factorization.

20421404344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250743 (or 250739 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20421404344 its reverse (44340412402), we get a palindrome (64761816746).

The spelling of 20421404344 in words is "twenty billion, four hundred twenty-one million, four hundred four thousand, three hundred forty-four".