20669465 has 4 divisors (see below), whose sum is σ = 24803364. Its totient is φ = 16535568.

The previous prime is 20669459. The next prime is 20669497. The reversal of 20669465 is 56496602.

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 10601536 + 10067929 = 3256^2 + 3173^2 .

It is a cyclic number.

It is not a de Polignac number, because 20669465 - 2⁶ = 20669401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2066942 + ... + 2066951.

It is an arithmetic number, because the mean of its divisors is an integer number (6200841).

Almost surely, 2^20669465 is an apocalyptic number.

It is an amenable number.

20669465 is a deficient number, since it is larger than the sum of its proper divisors (4133899).

20669465 is an equidigital number, since it uses as much as digits as its factorization.

20669465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133898.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 20669465 is about 4546.3683308769. The cubic root of 20669465 is about 274.4372624685.

The spelling of 20669465 in words is "twenty million, six hundred sixty-nine thousand, four hundred sixty-five".