20664430 has 8 divisors (see below), whose sum is σ = 37195992. Its totient is φ = 8265768.

The previous prime is 20664409. The next prime is 20664431. The reversal of 20664430 is 3446602.

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

It is a junction number, because it is equal to n+sod(n) for n = 20664395 and 20664404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033212 + ... + 1033231.

It is an arithmetic number, because the mean of its divisors is an integer number (4649499).

Almost surely, 2^20664430 is an apocalyptic number.

20664430 is a deficient number, since it is larger than the sum of its proper divisors (16531562).

20664430 is a wasteful number, since it uses less digits than its factorization.

20664430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066450.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20664430 is about 4545.8145584702. The cubic root of 20664430 is about 274.4149767146.

The spelling of 20664430 in words is "twenty million, six hundred sixty-four thousand, four hundred thirty".