20680165 has 8 divisors (see below), whose sum is σ = 27072288. Its totient is φ = 15040080.

The previous prime is 20680139. The next prime is 20680181. The reversal of 20680165 is 56108602.

20680165 = 67² + 68² + ... + 396².

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

It is not a de Polignac number, because 20680165 - 2⁵ = 20680133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187947 + ... + 188056.

It is an arithmetic number, because the mean of its divisors is an integer number (3384036).

Almost surely, 2^20680165 is an apocalyptic number.

It is an amenable number.

20680165 is a deficient number, since it is larger than the sum of its proper divisors (6392123).

20680165 is a wasteful number, since it uses less digits than its factorization.

20680165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376019.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20680165 is about 4547.5449420539. The cubic root of 20680165 is about 274.4846104468.

Adding to 20680165 its reverse (56108602), we get a palindrome (76788767).

The spelling of 20680165 in words is "twenty million, six hundred eighty thousand, one hundred sixty-five".