20664446 has 8 divisors (see below), whose sum is σ = 33814584. Its totient is φ = 9392920.

The previous prime is 20664437. The next prime is 20664461. The reversal of 20664446 is 64446602.

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

It is a Curzon number.

It is a congruent 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, 469625 + ... + 469668.

It is an arithmetic number, because the mean of its divisors is an integer number (4226823).

Almost surely, 2^20664446 is an apocalyptic number.

20664446 is a deficient number, since it is larger than the sum of its proper divisors (13150138).

20664446 is a wasteful number, since it uses less digits than its factorization.

20664446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939306.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 20664446 is about 4545.8163183305. The cubic root of 20664446 is about 274.4150475390.

It can be divided in two parts, 20 and 664446, that added together give a palindrome (664466).

The spelling of 20664446 in words is "twenty million, six hundred sixty-four thousand, four hundred forty-six".