20205696 has 64 divisors (see below), whose sum is σ = 61346880. Its totient is φ = 5772288.

The previous prime is 20205623. The next prime is 20205697. The reversal of 20205696 is 69650202.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (20205697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (958545).

Almost surely, 2^20205696 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 20205696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30673440).

20205696 is an abundant number, since it is smaller than the sum of its proper divisors (41141184).

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

20205696 is an equidigital number, since it uses as much as digits as its factorization.

20205696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541 (or 7529 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20205696 is about 4495.0746378675. The cubic root of 20205696 is about 272.3691642489.

Adding to 20205696 its reverse (69650202), we get a palindrome (89855898).

The spelling of 20205696 in words is "twenty million, two hundred five thousand, six hundred ninety-six".