20605506 has 8 divisors (see below), whose sum is σ = 41211024. Its totient is φ = 6868500.

The previous prime is 20605477. The next prime is 20605531. The reversal of 20605506 is 60550602.

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

20605506 is an admirable number.

It is a Curzon 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, 1717120 + ... + 1717131.

It is an arithmetic number, because the mean of its divisors is an integer number (5151378).

Almost surely, 2^20605506 is an apocalyptic number.

20605506 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.

20605506 is a wasteful number, since it uses less digits than its factorization.

20605506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434256.

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

The square root of 20605506 is about 4539.3288050107. The cubic root of 20605506 is about 274.1538997246.

The spelling of 20605506 in words is "twenty million, six hundred five thousand, five hundred six".