20207617 has 2 divisors, whose sum is σ = 20207618. Its totient is φ = 20207616.

The previous prime is 20207597. The next prime is 20207623. The reversal of 20207617 is 71670202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 3101121 = 4136^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20207617 - 2¹⁵ = 20174849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20207591 and 20207600.

It is not a weakly prime, because it can be changed into another prime (20207417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103808 + 10103809.

It is an arithmetic number, because the mean of its divisors is an integer number (10103809).

Almost surely, 2^20207617 is an apocalyptic number.

It is an amenable number.

20207617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20207617 is an equidigital number, since it uses as much as digits as its factorization.

20207617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 20207617 is about 4495.2883111098. The cubic root of 20207617 is about 272.3777955541.

Adding to 20207617 its reverse (71670202), we get a palindrome (91877819).

The spelling of 20207617 in words is "twenty million, two hundred seven thousand, six hundred seventeen".