20330605 has 4 divisors (see below), whose sum is σ = 24396732. Its totient is φ = 16264480.

The previous prime is 20330591. The next prime is 20330647. The reversal of 20330605 is 50603302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8031556 + 12299049 = 2834^2 + 3507^2 .

It is not a de Polignac number, because 20330605 - 2⁷ = 20330477 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 2033056 + ... + 2033065.

It is an arithmetic number, because the mean of its divisors is an integer number (6099183).

Almost surely, 2^20330605 is an apocalyptic number.

It is an amenable number.

20330605 is a deficient number, since it is larger than the sum of its proper divisors (4066127).

20330605 is an equidigital number, since it uses as much as digits as its factorization.

20330605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066126.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20330605 is about 4508.9472163688. The cubic root of 20330605 is about 272.9292619973.

Adding to 20330605 its reverse (50603302), we get a palindrome (70933907).

It can be divided in two parts, 20 and 330605, that added together give a square (330625 = 575²).

The spelling of 20330605 in words is "twenty million, three hundred thirty thousand, six hundred five".