20765217 has 8 divisors (see below), whose sum is σ = 30204000. Its totient is φ = 12584960.

The previous prime is 20765207. The next prime is 20765231. The reversal of 20765217 is 71256702.

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

It is a cyclic number.

It is not a de Polignac number, because 20765217 - 2⁴ = 20765201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20765207) 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, 314592 + ... + 314657.

It is an arithmetic number, because the mean of its divisors is an integer number (3775500).

Almost surely, 2^20765217 is an apocalyptic number.

It is an amenable number.

20765217 is a deficient number, since it is larger than the sum of its proper divisors (9438783).

20765217 is a wasteful number, since it uses less digits than its factorization.

20765217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629263.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 20765217 is about 4556.8867662034. The cubic root of 20765217 is about 274.8603897416.

The spelling of 20765217 in words is "twenty million, seven hundred sixty-five thousand, two hundred seventeen".