20608517 has 2 divisors, whose sum is σ = 20608518. Its totient is φ = 20608516.

The previous prime is 20608507. The next prime is 20608537. The reversal of 20608517 is 71580602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14853316 + 5755201 = 3854^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 20608517 - 2⁴ = 20608501 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20608517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20608507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10304258 + 10304259.

It is an arithmetic number, because the mean of its divisors is an integer number (10304259).

Almost surely, 2^20608517 is an apocalyptic number.

It is an amenable number.

20608517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20608517 is an equidigital number, since it uses as much as digits as its factorization.

20608517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20608517 is about 4539.6604498575. The cubic root of 20608517 is about 274.1672527444.

The spelling of 20608517 in words is "twenty million, six hundred eight thousand, five hundred seventeen".