20005696 has 14 divisors (see below), whose sum is σ = 39698930. Its totient is φ = 10002816.

The previous prime is 20005693. The next prime is 20005709. The reversal of 20005696 is 69650002.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 78400 = 4464^2 + 280^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156231 + ... + 156358.

Almost surely, 2^20005696 is an apocalyptic number.

It is an amenable number.

20005696 is a deficient number, since it is larger than the sum of its proper divisors (19693234).

20005696 is an equidigital number, since it uses as much as digits as its factorization.

20005696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312601 (or 312591 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20005696 is about 4472.7727418236. The cubic root of 20005696 is about 271.4675280848.

Adding to 20005696 its reverse (69650002), we get a palindrome (89655698).

The spelling of 20005696 in words is "twenty million, five thousand, six hundred ninety-six".