20593661 has 16 divisors (see below), whose sum is σ = 23355648. Its totient is φ = 17995200.

The previous prime is 20593649. The next prime is 20593673. The reversal of 20593661 is 16639502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20593649) and next prime (20593673).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20593661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31211 + ... + 31863.

It is an arithmetic number, because the mean of its divisors is an integer number (1459728).

Almost surely, 2^20593661 is an apocalyptic number.

It is an amenable number.

20593661 is a deficient number, since it is larger than the sum of its proper divisors (2761987).

20593661 is a wasteful number, since it uses less digits than its factorization.

20593661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20593661 is about 4538.0239091481. The cubic root of 20593661 is about 274.1013575322.

The spelling of 20593661 in words is "twenty million, five hundred ninety-three thousand, six hundred sixty-one".