20442440420 has 12 divisors (see below), whose sum is σ = 42929124924. Its totient is φ = 8176976160.

The previous prime is 20442440407. The next prime is 20442440437. The reversal of 20442440420 is 2404424402.

It can be written as a sum of positive squares in 2 ways, for example, as 10638272164 + 9804168256 = 103142^2 + 99016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20442440420.

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 3 ways as a sum of consecutive naturals, for example, 511060991 + ... + 511061030.

It is an arithmetic number, because the mean of its divisors is an integer number (3577427077).

Almost surely, 2^20442440420 is an apocalyptic number.

20442440420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20442440420 is an abundant number, since it is smaller than the sum of its proper divisors (22486684504).

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

20442440420 is a wasteful number, since it uses less digits than its factorization.

20442440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022122030 (or 1022122028 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20442440420 its reverse (2404424402), we get a palindrome (22846864822).

The spelling of 20442440420 in words is "twenty billion, four hundred forty-two million, four hundred forty thousand, four hundred twenty".