20605512 has 16 divisors (see below), whose sum is σ = 51513840. Its totient is φ = 6868496.

The previous prime is 20605477. The next prime is 20605531. The reversal of 20605512 is 21550602.

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, 429258 + ... + 429305.

It is an arithmetic number, because the mean of its divisors is an integer number (3219615).

Almost surely, 2^20605512 is an apocalyptic number.

It is an amenable number.

20605512 is an abundant number, since it is smaller than the sum of its proper divisors (30908328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20605512 is a wasteful number, since it uses less digits than its factorization.

20605512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858572 (or 858568 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20605512 is about 4539.3294659013. The cubic root of 20605512 is about 274.1539263344.

The spelling of 20605512 in words is "twenty million, six hundred five thousand, five hundred twelve".