20680617 has 8 divisors (see below), whose sum is σ = 27617824. Its totient is φ = 13765248.

The previous prime is 20680613. The next prime is 20680631. The reversal of 20680617 is 71608602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20680617 - 2² = 20680613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20680613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3103 + ... + 7140.

It is an arithmetic number, because the mean of its divisors is an integer number (3452228).

Almost surely, 2^20680617 is an apocalyptic number.

It is an amenable number.

20680617 is a deficient number, since it is larger than the sum of its proper divisors (6937207).

20680617 is a wasteful number, since it uses less digits than its factorization.

20680617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10919.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20680617 is about 4547.5946389273. The cubic root of 20680617 is about 274.4866102075.

The spelling of 20680617 in words is "twenty million, six hundred eighty thousand, six hundred seventeen".