20452564 has 48 divisors (see below), whose sum is σ = 42517440. Its totient is φ = 8501760.

The previous prime is 20452559. The next prime is 20452573. The reversal of 20452564 is 46525402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27307 + ... + 28045.

It is an arithmetic number, because the mean of its divisors is an integer number (885780).

Almost surely, 2^20452564 is an apocalyptic number.

It is an amenable number.

20452564 is an abundant number, since it is smaller than the sum of its proper divisors (22064876).

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

20452564 is a wasteful number, since it uses less digits than its factorization.

20452564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 806 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 20452564 is about 4522.4511053189. The cubic root of 20452564 is about 273.4739226519.

Adding to 20452564 its reverse (46525402), we get a palindrome (66977966).

The spelling of 20452564 in words is "twenty million, four hundred fifty-two thousand, five hundred sixty-four".