20563608 has 64 divisors (see below), whose sum is σ = 58635360. Its totient is φ = 5953536.

The previous prime is 20563607. The next prime is 20563637. The reversal of 20563608 is 80636502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3366 + ... + 7242.

Almost surely, 2^20563608 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 20563608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29317680).

20563608 is an abundant number, since it is smaller than the sum of its proper divisors (38071752).

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

20563608 is a wasteful number, since it uses less digits than its factorization.

20563608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916 (or 3912 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20563608 is about 4534.7114571933. The cubic root of 20563608 is about 273.9679576077.

The spelling of 20563608 in words is "twenty million, five hundred sixty-three thousand, six hundred eight".