20004563 has 8 divisors (see below), whose sum is σ = 21632832. Its totient is φ = 18426496.

The previous prime is 20004559. The next prime is 20004581. The reversal of 20004563 is 36540002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20004563 - 2² = 20004559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20004533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11720 + ... + 13317.

It is an arithmetic number, because the mean of its divisors is an integer number (2704104).

Almost surely, 2^20004563 is an apocalyptic number.

20004563 is a deficient number, since it is larger than the sum of its proper divisors (1628269).

20004563 is a wasteful number, since it uses less digits than its factorization.

20004563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25101.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20004563 is about 4472.6460848138. The cubic root of 20004563 is about 271.4624032358.

Adding to 20004563 its reverse (36540002), we get a palindrome (56544565).

The spelling of 20004563 in words is "twenty million, four thousand, five hundred sixty-three".