20243564 has 12 divisors (see below), whose sum is σ = 38646888. Its totient is φ = 9201600.

The previous prime is 20243563. The next prime is 20243579. The reversal of 20243564 is 46534202.

It is not an unprimeable number, because it can be changed into a prime (20243563) 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, 229997 + ... + 230084.

It is an arithmetic number, because the mean of its divisors is an integer number (3220574).

Almost surely, 2^20243564 is an apocalyptic number.

It is an amenable number.

20243564 is a deficient number, since it is larger than the sum of its proper divisors (18403324).

20243564 is a wasteful number, since it uses less digits than its factorization.

20243564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460096 (or 460094 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20243564 is about 4499.2848320594. The cubic root of 20243564 is about 272.5392093511.

Adding to 20243564 its reverse (46534202), we get a palindrome (66777766).

The spelling of 20243564 in words is "twenty million, two hundred forty-three thousand, five hundred sixty-four".