20685835 has 16 divisors (see below), whose sum is σ = 25765632. Its totient is φ = 15926400.

The previous prime is 20685823. The next prime is 20685869. The reversal of 20685835 is 53858602.

It is not a de Polignac number, because 20685835 - 2¹¹ = 20683787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20685794 and 20685803.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48925 + ... + 49345.

It is an arithmetic number, because the mean of its divisors is an integer number (1610352).

Almost surely, 2^20685835 is an apocalyptic number.

20685835 is a deficient number, since it is larger than the sum of its proper divisors (5079797).

20685835 is a wasteful number, since it uses less digits than its factorization.

20685835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 20685835 is about 4548.1683126287. The cubic root of 20685835 is about 274.5096938303.

The spelling of 20685835 in words is "twenty million, six hundred eighty-five thousand, eight hundred thirty-five".