20809696 has 24 divisors (see below), whose sum is σ = 41159664. Its totient is φ = 10356480.

The previous prime is 20809669. The next prime is 20809699. The reversal of 20809696 is 69690802.

It is a happy number.

It is a super-2 number, since 2×20809696² = 866086895224832, which contains 22 as substring.

20809696 is a modest number, since divided by 9696 gives 2080 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20809699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6061 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (1714986).

Almost surely, 2^20809696 is an apocalyptic number.

It is an amenable number.

20809696 is a deficient number, since it is larger than the sum of its proper divisors (20349968).

20809696 is a wasteful number, since it uses less digits than its factorization.

20809696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034 (or 3026 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 20809696 is about 4561.7645708651. The cubic root of 20809696 is about 275.0564996859.

The spelling of 20809696 in words is "twenty million, eight hundred nine thousand, six hundred ninety-six".