20559056 has 60 divisors (see below), whose sum is σ = 47726112. Its totient is φ = 8403648.

The previous prime is 20559047. The next prime is 20559061. The reversal of 20559056 is 65095502.

It is a super-2 number, since 2×20559056² = 845349567222272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59075 + ... + 59421.

Almost surely, 2^20559056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20559056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23863056).

20559056 is an abundant number, since it is smaller than the sum of its proper divisors (27167056).

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

20559056 is a wasteful number, since it uses less digits than its factorization.

20559056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 20559056 is about 4534.2095231694. The cubic root of 20559056 is about 273.9477407571.

It can be divided in two parts, 2055 and 9056, that added together give a palindrome (11111).

The spelling of 20559056 in words is "twenty million, five hundred fifty-nine thousand, fifty-six".