20504051443109 has 16 divisors (see below), whose sum is σ = 22498574161392. Its totient is φ = 18569162247168.

The previous prime is 20504051443093. The next prime is 20504051443147. The reversal of 20504051443109 is 90134415040502.

It can be written as a sum of positive squares in 8 ways, for example, as 3370271788900 + 17133779654209 = 1835830^2 + 4139297^2 .

It is not a de Polignac number, because 20504051443109 - 2⁴ = 20504051443093 is a prime.

It is a super-2 number, since 2×20504051443109² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504051443189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24066287 + ... + 24903699.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160885087).

Almost surely, 2^{20504051443109} is an apocalyptic number.

It is an amenable number.

20504051443109 is a deficient number, since it is larger than the sum of its proper divisors (1994522718283).

20504051443109 is a wasteful number, since it uses less digits than its factorization.

20504051443109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873016.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 20504051443109 in words is "twenty trillion, five hundred four billion, fifty-one million, four hundred forty-three thousand, one hundred nine".