20664345 has 16 divisors (see below), whose sum is σ = 35606592. Its totient is φ = 10173120.

The previous prime is 20664313. The next prime is 20664353. The reversal of 20664345 is 54346602.

It is not a de Polignac number, because 20664345 - 2⁵ = 20664313 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52791 + ... + 53180.

It is an arithmetic number, because the mean of its divisors is an integer number (2225412).

Almost surely, 2^20664345 is an apocalyptic number.

It is an amenable number.

20664345 is a deficient number, since it is larger than the sum of its proper divisors (14942247).

20664345 is a wasteful number, since it uses less digits than its factorization.

20664345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105992.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20664345 is about 4545.8052092011. The cubic root of 20664345 is about 274.4146004593.

The spelling of 20664345 in words is "twenty million, six hundred sixty-four thousand, three hundred forty-five".