20600665 has 4 divisors (see below), whose sum is σ = 24720804. Its totient is φ = 16480528.

The previous prime is 20600653. The next prime is 20600669. The reversal of 20600665 is 56600602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2893401 + 17707264 = 1701^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20600665 - 2⁵ = 20600633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20600669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060062 + ... + 2060071.

It is an arithmetic number, because the mean of its divisors is an integer number (6180201).

Almost surely, 2^20600665 is an apocalyptic number.

It is an amenable number.

20600665 is a deficient number, since it is larger than the sum of its proper divisors (4120139).

20600665 is an equidigital number, since it uses as much as digits as its factorization.

20600665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120138.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20600665 is about 4538.7955450758. The cubic root of 20600665 is about 274.1324283927.

The spelling of 20600665 in words is "twenty million, six hundred thousand, six hundred sixty-five".