20768817 has 8 divisors (see below), whose sum is σ = 27961024. Its totient is φ = 13711248.

The previous prime is 20768801. The next prime is 20768819. The reversal of 20768817 is 71886702.

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

It is not a de Polignac number, because 20768817 - 2⁴ = 20768801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20768819) 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, 33298 + ... + 33915.

It is an arithmetic number, because the mean of its divisors is an integer number (3495128).

Almost surely, 2^20768817 is an apocalyptic number.

It is an amenable number.

20768817 is a deficient number, since it is larger than the sum of its proper divisors (7192207).

20768817 is a wasteful number, since it uses less digits than its factorization.

20768817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67319.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 20768817 is about 4557.2817556083. The cubic root of 20768817 is about 274.8762727159.

The spelling of 20768817 in words is "twenty million, seven hundred sixty-eight thousand, eight hundred seventeen".