20789836 has 6 divisors (see below), whose sum is σ = 36382220. Its totient is φ = 10394916.

The previous prime is 20789801. The next prime is 20789843. The reversal of 20789836 is 63898702.

It is a junction number, because it is equal to n+sod(n) for n = 20789792 and 20789801.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2598726 + ... + 2598733.

Almost surely, 2^20789836 is an apocalyptic number.

It is an amenable number.

20789836 is a deficient number, since it is larger than the sum of its proper divisors (15592384).

20789836 is a wasteful number, since it uses less digits than its factorization.

20789836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197463 (or 5197461 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20789836 is about 4559.5872620227. The cubic root of 20789836 is about 274.9689706036.

The spelling of 20789836 in words is "twenty million, seven hundred eighty-nine thousand, eight hundred thirty-six".