20440303420 has 12 divisors (see below), whose sum is σ = 42924637224. Its totient is φ = 8176121360.

The previous prime is 20440303357. The next prime is 20440303423. The reversal of 20440303420 is 2430304402.

It is a junction number, because it is equal to n+sod(n) for n = 20440303391 and 20440303400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440303423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511007566 + ... + 511007605.

It is an arithmetic number, because the mean of its divisors is an integer number (3577053102).

Almost surely, 2^20440303420 is an apocalyptic number.

20440303420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440303420 is an abundant number, since it is smaller than the sum of its proper divisors (22484333804).

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

20440303420 is a wasteful number, since it uses less digits than its factorization.

20440303420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022015180 (or 1022015178 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

Adding to 20440303420 its reverse (2430304402), we get a palindrome (22870607822).

The spelling of 20440303420 in words is "twenty billion, four hundred forty million, three hundred three thousand, four hundred twenty".