20522617 has 2 divisors, whose sum is σ = 20522618. Its totient is φ = 20522616.

The previous prime is 20522609. The next prime is 20522639. The reversal of 20522617 is 71622502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 2298256 = 4269^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522617 - 2³ = 20522609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20522591 and 20522600.

It is not a weakly prime, because it can be changed into another prime (20522687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261308 + 10261309.

It is an arithmetic number, because the mean of its divisors is an integer number (10261309).

Almost surely, 2^20522617 is an apocalyptic number.

It is an amenable number.

20522617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20522617 is an equidigital number, since it uses as much as digits as its factorization.

20522617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20522617 is about 4530.1895103847. The cubic root of 20522617 is about 273.7857961433.

It can be divided in two parts, 205 and 22617, that added together give a palindrome (22822).

The spelling of 20522617 in words is "twenty million, five hundred twenty-two thousand, six hundred seventeen".