20664562 has 4 divisors (see below), whose sum is σ = 30996846. Its totient is φ = 10332280.

The previous prime is 20664529. The next prime is 20664587. The reversal of 20664562 is 26546602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 3200521 = 4179^2 + 1789^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5166139 + ... + 5166142.

Almost surely, 2^20664562 is an apocalyptic number.

20664562 is a deficient number, since it is larger than the sum of its proper divisors (10332284).

20664562 is a wasteful number, since it uses less digits than its factorization.

20664562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332283.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20664562 is about 4545.8290772971. The cubic root of 20664562 is about 274.4155610149.

The spelling of 20664562 in words is "twenty million, six hundred sixty-four thousand, five hundred sixty-two".