20187836 has 12 divisors (see below), whose sum is σ = 36864912. Its totient is φ = 9655008.

The previous prime is 20187833. The next prime is 20187887. The reversal of 20187836 is 63878102.

It is a junction number, because it is equal to n+sod(n) for n = 20187796 and 20187805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20187833) 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, 109625 + ... + 109808.

It is an arithmetic number, because the mean of its divisors is an integer number (3072076).

Almost surely, 2^20187836 is an apocalyptic number.

It is an amenable number.

20187836 is a deficient number, since it is larger than the sum of its proper divisors (16677076).

20187836 is a wasteful number, since it uses less digits than its factorization.

20187836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219460 (or 219458 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20187836 is about 4493.0875798275. The cubic root of 20187836 is about 272.2888907254.

The spelling of 20187836 in words is "twenty million, one hundred eighty-seven thousand, eight hundred thirty-six".