20500566 has 8 divisors (see below), whose sum is σ = 41001144. Its totient is φ = 6833520.

The previous prime is 20500541. The next prime is 20500577. The reversal of 20500566 is 66500502.

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

20500566 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, 1708375 + ... + 1708386.

It is an arithmetic number, because the mean of its divisors is an integer number (5125143).

Almost surely, 2^20500566 is an apocalyptic number.

20500566 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.

20500566 is a wasteful number, since it uses less digits than its factorization.

20500566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416766.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20500566 is about 4527.7550728810. The cubic root of 20500566 is about 273.6877025105.

The spelling of 20500566 in words is "twenty million, five hundred thousand, five hundred sixty-six".