20105504 has 24 divisors (see below), whose sum is σ = 40654908. Its totient is φ = 9780480.

The previous prime is 20105483. The next prime is 20105507. The reversal of 20105504 is 40550102.

It can be written as a sum of positive squares in 2 ways, for example, as 14592400 + 5513104 = 3820^2 + 2348^2 .

It is not an unprimeable number, because it can be changed into a prime (20105507) 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, 7307 + ... + 9674.

Almost surely, 2^20105504 is an apocalyptic number.

It is an amenable number.

20105504 is an abundant number, since it is smaller than the sum of its proper divisors (20549404).

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

20105504 is a wasteful number, since it uses less digits than its factorization.

20105504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17028 (or 17020 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20105504 is about 4483.9161455139. The cubic root of 20105504 is about 271.9182280143.

Adding to 20105504 its reverse (40550102), we get a palindrome (60655606).

The spelling of 20105504 in words is "twenty million, one hundred five thousand, five hundred four".