20168685 has 12 divisors (see below), whose sum is σ = 34959132. Its totient is φ = 10756608.

The previous prime is 20168683. The next prime is 20168689. The reversal of 20168685 is 58686102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11329956 + 8838729 = 3366^2 + 2973^2 .

It is not a de Polignac number, because 20168685 - 2¹ = 20168683 is a prime.

It is a Curzon number.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20168683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224052 + ... + 224141.

It is an arithmetic number, because the mean of its divisors is an integer number (2913261).

Almost surely, 2^20168685 is an apocalyptic number.

It is an amenable number.

20168685 is a deficient number, since it is larger than the sum of its proper divisors (14790447).

20168685 is a wasteful number, since it uses less digits than its factorization.

20168685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448204 (or 448201 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20168685 is about 4490.9559116072. The cubic root of 20168685 is about 272.2027620562.

It can be divided in two parts, 2016 and 8685, that added together give a palindrome (10701).

The spelling of 20168685 in words is "twenty million, one hundred sixty-eight thousand, six hundred eighty-five".