20665069 has 4 divisors (see below), whose sum is σ = 21145696. Its totient is φ = 20184444.

The previous prime is 20665067. The next prime is 20665093. The reversal of 20665069 is 96056602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20665069 - 2¹ = 20665067 is a prime.

It is a super-2 number, since 2×20665069² = 854090153549522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665067) 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, 240249 + ... + 240334.

It is an arithmetic number, because the mean of its divisors is an integer number (5286424).

Almost surely, 2^20665069 is an apocalyptic number.

It is an amenable number.

20665069 is a deficient number, since it is larger than the sum of its proper divisors (480627).

20665069 is an equidigital number, since it uses as much as digits as its factorization.

20665069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480626.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20665069 is about 4545.8848423602. The cubic root of 20665069 is about 274.4178052362.

The spelling of 20665069 in words is "twenty million, six hundred sixty-five thousand, sixty-nine".