20168709 has 24 divisors (see below), whose sum is σ = 30979872. Its totient is φ = 11573280.

The previous prime is 20168699. The next prime is 20168711. The reversal of 20168709 is 90786102.

It is not a de Polignac number, because 20168709 - 2⁷ = 20168581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 20168709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20168009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11067 + ... + 12759.

It is an arithmetic number, because the mean of its divisors is an integer number (1290828).

Almost surely, 2^20168709 is an apocalyptic number.

It is an amenable number.

20168709 is a deficient number, since it is larger than the sum of its proper divisors (10811163).

20168709 is a wasteful number, since it uses less digits than its factorization.

20168709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745 (or 1726 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20168709 is about 4490.9585836434. The cubic root of 20168709 is about 272.2028700266.

The spelling of 20168709 in words is "twenty million, one hundred sixty-eight thousand, seven hundred nine".