20003564 has 18 divisors (see below), whose sum is σ = 40721940. Its totient is φ = 8572872.

The previous prime is 20003563. The next prime is 20003567. The reversal of 20003564 is 46530002.

It is not an unprimeable number, because it can be changed into a prime (20003563) 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 5 ways as a sum of consecutive naturals, for example, 50834 + ... + 51225.

It is an arithmetic number, because the mean of its divisors is an integer number (2262330).

Almost surely, 2^20003564 is an apocalyptic number.

It is an amenable number.

20003564 is an abundant number, since it is smaller than the sum of its proper divisors (20718376).

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

20003564 is a wasteful number, since it uses less digits than its factorization.

20003564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102077 (or 102068 counting only the distinct ones).

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

The square root of 20003564 is about 4472.5344045630. The cubic root of 20003564 is about 271.4578843425.

Adding to 20003564 its reverse (46530002), we get a palindrome (66533566).

The spelling of 20003564 in words is "twenty million, three thousand, five hundred sixty-four".