20104563 has 12 divisors (see below), whose sum is σ = 27267864. Its totient is φ = 13176000.

The previous prime is 20104559. The next prime is 20104571. The reversal of 20104563 is 36540102.

It is a happy number.

It is not a de Polignac number, because 20104563 - 2² = 20104559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20204563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10263 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (2272322).

Almost surely, 2^20104563 is an apocalyptic number.

20104563 is a deficient number, since it is larger than the sum of its proper divisors (7163301).

20104563 is an equidigital number, since it uses as much as digits as its factorization.

20104563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20104563 is about 4483.8112136886. The cubic root of 20104563 is about 271.9139857424.

Adding to 20104563 its reverse (36540102), we get a palindrome (56644665).

The spelling of 20104563 in words is "twenty million, one hundred four thousand, five hundred sixty-three".