20836858 has 24 divisors (see below), whose sum is σ = 36782100. Its totient is φ = 8826048.

The previous prime is 20836847. The next prime is 20836889. The reversal of 20836858 is 85863802.

It can be written as a sum of positive squares in 2 ways, for example, as 18896409 + 1940449 = 4347^2 + 1393^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20836858.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7528 + ... + 9916.

Almost surely, 2^20836858 is an apocalyptic number.

20836858 is a deficient number, since it is larger than the sum of its proper divisors (15945242).

20836858 is a wasteful number, since it uses less digits than its factorization.

20836858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20836858 is about 4564.7407374352. The cubic root of 20836858 is about 275.1761207901.

The spelling of 20836858 in words is "twenty million, eight hundred thirty-six thousand, eight hundred fifty-eight".