20806396 has 12 divisors (see below), whose sum is σ = 39212152. Its totient is φ = 9602928.

The previous prime is 20806391. The next prime is 20806397. The reversal of 20806396 is 69360802.

It is a happy number.

It is a super-2 number, since 2×20806396² = 865812229017632, which contains 22 as substring.

20806396 is a modest number, since divided by 6396 gives 208 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200010 + ... + 200113.

Almost surely, 2^20806396 is an apocalyptic number.

20806396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20806396 is a deficient number, since it is larger than the sum of its proper divisors (18405756).

20806396 is a wasteful number, since it uses less digits than its factorization.

20806396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400140 (or 400138 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20806396 is about 4561.4028543859. The cubic root of 20806396 is about 275.0419594377.

The spelling of 20806396 in words is "twenty million, eight hundred six thousand, three hundred ninety-six".