20066646 has 8 divisors (see below), whose sum is σ = 40133304. Its totient is φ = 6688880.

The previous prime is 20066639. The next prime is 20066687. The reversal of 20066646 is 64666002.

20066646 is nontrivially palindromic in base 12.

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

20066646 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1672215 + ... + 1672226.

It is an arithmetic number, because the mean of its divisors is an integer number (5016663).

Almost surely, 2^20066646 is an apocalyptic number.

20066646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20066646 is a wasteful number, since it uses less digits than its factorization.

20066646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344446.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20066646 is about 4479.5810071925. The cubic root of 20066646 is about 271.7429358334.

The spelling of 20066646 in words is "twenty million, sixty-six thousand, six hundred forty-six".