20816617 has 2 divisors, whose sum is σ = 20816618. Its totient is φ = 20816616.

The previous prime is 20816611. The next prime is 20816623. The reversal of 20816617 is 71661802.

It is a balanced prime because it is at equal distance from previous prime (20816611) and next prime (20816623).

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 5363856 = 3931^2 + 2316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20816617 - 2⁷ = 20816489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20816611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10408308 + 10408309.

It is an arithmetic number, because the mean of its divisors is an integer number (10408309).

Almost surely, 2^20816617 is an apocalyptic number.

It is an amenable number.

20816617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20816617 is an equidigital number, since it uses as much as digits as its factorization.

20816617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20816617 is about 4562.5230958320. The cubic root of 20816617 is about 275.0869895600.

The spelling of 20816617 in words is "twenty million, eight hundred sixteen thousand, six hundred seventeen".