20664542 has 8 divisors (see below), whose sum is σ = 31459656. Its totient is φ = 10177992.

The previous prime is 20664529. The next prime is 20664587. The reversal of 20664542 is 24546602.

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

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, 76973 + ... + 77240.

It is an arithmetic number, because the mean of its divisors is an integer number (3932457).

Almost surely, 2^20664542 is an apocalyptic number.

20664542 is a deficient number, since it is larger than the sum of its proper divisors (10795114).

20664542 is a wasteful number, since it uses less digits than its factorization.

20664542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154282.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20664542 is about 4545.8268774778. The cubic root of 20664542 is about 274.4154724847.

The spelling of 20664542 in words is "twenty million, six hundred sixty-four thousand, five hundred forty-two".