20796917 has 2 divisors, whose sum is σ = 20796918. Its totient is φ = 20796916.

The previous prime is 20796901. The next prime is 20796929. The reversal of 20796917 is 71969702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 4036081 = 4094^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 20796917 - 2⁴ = 20796901 is a prime.

It is a super-3 number, since 3×20796917³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20796947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10398458 + 10398459.

It is an arithmetic number, because the mean of its divisors is an integer number (10398459).

Almost surely, 2^20796917 is an apocalyptic number.

It is an amenable number.

20796917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20796917 is an equidigital number, since it uses as much as digits as its factorization.

20796917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 20796917 is about 4560.3636916369. The cubic root of 20796917 is about 275.0001851238. Note that the first 3 decimals are identical.

The spelling of 20796917 in words is "twenty million, seven hundred ninety-six thousand, nine hundred seventeen".