20044400020 has 12 divisors (see below), whose sum is σ = 42093240084. Its totient is φ = 8017760000.

The previous prime is 20044399979. The next prime is 20044400041. The reversal of 20044400020 is 2000444002.

It can be written as a sum of positive squares in 2 ways, for example, as 10146935824 + 9897464196 = 100732^2 + 99486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20044399967 and 20044400003.

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 3 ways as a sum of consecutive naturals, for example, 501109981 + ... + 501110020.

It is an arithmetic number, because the mean of its divisors is an integer number (3507770007).

Almost surely, 2^20044400020 is an apocalyptic number.

20044400020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20044400020 is an abundant number, since it is smaller than the sum of its proper divisors (22048840064).

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

20044400020 is a wasteful number, since it uses less digits than its factorization.

20044400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002220010 (or 1002220008 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20044400020 its reverse (2000444002), we get a palindrome (22044844022).

The spelling of 20044400020 in words is "twenty billion, forty-four million, four hundred thousand, twenty".