20685942 has 20 divisors (see below), whose sum is σ = 46352196. Its totient is φ = 6895260.

The previous prime is 20685919. The next prime is 20685971. The reversal of 20685942 is 24958602.

It is a happy number.

20685942 is a `hidden beast` number, since 2 + 0 + 68 + 594 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20685897 and 20685906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63684 + ... + 64007.

Almost surely, 2^20685942 is an apocalyptic number.

20685942 is an abundant number, since it is smaller than the sum of its proper divisors (25666254).

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

20685942 is a wasteful number, since it uses less digits than its factorization.

20685942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127705 (or 127696 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20685942 is about 4548.1800755907. The cubic root of 20685942 is about 274.5101671411.

The spelling of 20685942 in words is "twenty million, six hundred eighty-five thousand, nine hundred forty-two".