20669642 has 8 divisors (see below), whose sum is σ = 35433696. Its totient is φ = 8858412.

The previous prime is 20669641. The next prime is 20669651. The reversal of 20669642 is 24696602.

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

It is not an unprimeable number, because it can be changed into a prime (20669641) 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, 738188 + ... + 738215.

It is an arithmetic number, because the mean of its divisors is an integer number (4429212).

Almost surely, 2^20669642 is an apocalyptic number.

20669642 is a deficient number, since it is larger than the sum of its proper divisors (14764054).

20669642 is a wasteful number, since it uses less digits than its factorization.

20669642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476412.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20669642 is about 4546.3877969219. The cubic root of 20669642 is about 274.4380458343.

The spelling of 20669642 in words is "twenty million, six hundred sixty-nine thousand, six hundred forty-two".