20205568 has 26 divisors (see below), whose sum is σ = 40414394. Its totient is φ = 10100736.

The previous prime is 20205557. The next prime is 20205587. The reversal of 20205568 is 86550202.

It can be written as a sum of positive squares in only one way, i.e., 15745024 + 4460544 = 3968^2 + 2112^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630 + ... + 6562.

Almost surely, 2^20205568 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 20205568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20207197).

20205568 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20205568 is an frugal number, since it uses more digits than its factorization.

20205568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957 (or 4935 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20205568 is about 4495.0604000391. The cubic root of 20205568 is about 272.3685891087.

The spelling of 20205568 in words is "twenty million, two hundred five thousand, five hundred sixty-eight".