20308717 has 8 divisors (see below), whose sum is σ = 23859360. Its totient is φ = 17042160.

The previous prime is 20308681. The next prime is 20308723. The reversal of 20308717 is 71780302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20308717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20348717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70867 + ... + 71152.

It is an arithmetic number, because the mean of its divisors is an integer number (2982420).

Almost surely, 2^20308717 is an apocalyptic number.

It is an amenable number.

20308717 is a deficient number, since it is larger than the sum of its proper divisors (3550643).

20308717 is a wasteful number, since it uses less digits than its factorization.

20308717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142043.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20308717 is about 4506.5193886191. The cubic root of 20308717 is about 272.8312812961.

It can be divided in two parts, 20308 and 717, that added together give a square (21025 = 145²).

The spelling of 20308717 in words is "twenty million, three hundred eight thousand, seven hundred seventeen".