20066605 has 16 divisors (see below), whose sum is σ = 26293680. Its totient is φ = 14611968.

The previous prime is 20066587. The next prime is 20066611. The reversal of 20066605 is 50666002.

It can be written as a sum of positive squares in 8 ways, for example, as 335241 + 19731364 = 579^2 + 4442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20066605 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20066605.

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 15 ways as a sum of consecutive naturals, for example, 2631 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1643355).

Almost surely, 2^20066605 is an apocalyptic number.

It is an amenable number.

20066605 is a deficient number, since it is larger than the sum of its proper divisors (6227075).

20066605 is a wasteful number, since it uses less digits than its factorization.

20066605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4320.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20066605 is about 4479.5764308693. The cubic root of 20066605 is about 271.7427507590.

The spelling of 20066605 in words is "twenty million, sixty-six thousand, six hundred five".