20607617 has 4 divisors (see below), whose sum is σ = 20622336. Its totient is φ = 20592900.

The previous prime is 20607611. The next prime is 20607623. The reversal of 20607617 is 71670602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71670602 = 2 ⋅35835301.

It is an interprime number because it is at equal distance from previous prime (20607611) and next prime (20607623).

It is a cyclic number.

It is not a de Polignac number, because 20607617 - 2⁸ = 20607361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20607617.

It is not an unprimeable number, because it can be changed into a prime (20607611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5009 + ... + 8142.

It is an arithmetic number, because the mean of its divisors is an integer number (5155584).

Almost surely, 2^20607617 is an apocalyptic number.

It is an amenable number.

20607617 is a deficient number, since it is larger than the sum of its proper divisors (14719).

20607617 is a wasteful number, since it uses less digits than its factorization.

20607617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14718.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20607617 is about 4539.5613224187. The cubic root of 20607617 is about 274.1632616094.

The spelling of 20607617 in words is "twenty million, six hundred seven thousand, six hundred seventeen".