20664061 has 8 divisors (see below), whose sum is σ = 23868864. Its totient is φ = 17680320.

The previous prime is 20664031. The next prime is 20664113. The reversal of 20664061 is 16046602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20664061 - 2¹⁵ = 20631293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55065 + ... + 55438.

It is an arithmetic number, because the mean of its divisors is an integer number (2983608).

Almost surely, 2^20664061 is an apocalyptic number.

It is an amenable number.

20664061 is a deficient number, since it is larger than the sum of its proper divisors (3204803).

20664061 is a wasteful number, since it uses less digits than its factorization.

20664061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110531.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20664061 is about 4545.7739715036. The cubic root of 20664061 is about 274.4133433164.

The spelling of 20664061 in words is "twenty million, six hundred sixty-four thousand, sixty-one".