20000105505 has 12 divisors (see below), whose sum is σ = 34666849620. Its totient is φ = 10666722912.

The previous prime is 20000105497. The next prime is 20000105539. The reversal of 20000105505 is 50550100002.

It can be written as a sum of positive squares in 2 ways, for example, as 13295934864 + 6704170641 = 115308^2 + 81879^2 .

It is not a de Polignac number, because 20000105505 - 2³ = 20000105497 is a prime.

It is a super-2 number, since 2×20000105505² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222223350 + ... + 222223439.

It is an arithmetic number, because the mean of its divisors is an integer number (2888904135).

Almost surely, 2^20000105505 is an apocalyptic number.

It is an amenable number.

20000105505 is a deficient number, since it is larger than the sum of its proper divisors (14666744115).

20000105505 is a wasteful number, since it uses less digits than its factorization.

20000105505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444446800 (or 444446797 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

Adding to 20000105505 its reverse (50550100002), we get a palindrome (70550205507).

The spelling of 20000105505 in words is "twenty billion, one hundred five thousand, five hundred five".