20807836 has 12 divisors (see below), whose sum is σ = 41615728. Its totient is φ = 8917632.

The previous prime is 20807833. The next prime is 20807837. The reversal of 20807836 is 63870802.

It is a happy number.

20807836 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20807833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371541 + ... + 371596.

Almost surely, 2^20807836 is an apocalyptic number.

It is an amenable number.

20807836 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.

20807836 is a wasteful number, since it uses less digits than its factorization.

20807836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743148 (or 743146 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20807836 is about 4561.5606978314. The cubic root of 20807836 is about 275.0483044624.

The spelling of 20807836 in words is "twenty million, eight hundred seven thousand, eight hundred thirty-six".