20965717 has 8 divisors (see below), whose sum is σ = 21794976. Its totient is φ = 20150352.

The previous prime is 20965669. The next prime is 20965723. The reversal of 20965717 is 71756902.

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 20965717 - 2²³ = 12577109 is a prime.

It is a super-2 number, since 2×20965717² = 879122578648178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965727) 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, 343 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (2724372).

Almost surely, 2^20965717 is an apocalyptic number.

It is an amenable number.

20965717 is a deficient number, since it is larger than the sum of its proper divisors (829259).

20965717 is an equidigital number, since it uses as much as digits as its factorization.

20965717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20965717 is about 4578.8335850957. The cubic root of 20965717 is about 275.7422022181.

The spelling of 20965717 in words is "twenty million, nine hundred sixty-five thousand, seven hundred seventeen".