20836836 has 36 divisors (see below), whose sum is σ = 54372864. Its totient is φ = 6721200.

The previous prime is 20836831. The next prime is 20836847. The reversal of 20836836 is 63863802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20836836.

It is not an unprimeable number, because it can be changed into a prime (20836831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8220 + ... + 10451.

Almost surely, 2^20836836 is an apocalyptic number.

It is an amenable number.

20836836 is an abundant number, since it is smaller than the sum of its proper divisors (33536028).

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

20836836 is a wasteful number, since it uses less digits than its factorization.

20836836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18712 (or 18707 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20836836 is about 4564.7383276591. The cubic root of 20836836 is about 275.1760239444.

The spelling of 20836836 in words is "twenty million, eight hundred thirty-six thousand, eight hundred thirty-six".