20581693 has 24 divisors (see below), whose sum is σ = 24359616. Its totient is φ = 17236800.

The previous prime is 20581681. The next prime is 20581703. The reversal of 20581693 is 39618502.

It is not a de Polignac number, because 20581693 - 2⁵ = 20581661 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 (20581643) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 281905 + ... + 281977.

It is an arithmetic number, because the mean of its divisors is an integer number (1014984).

Almost surely, 2^20581693 is an apocalyptic number.

It is an amenable number.

20581693 is a deficient number, since it is larger than the sum of its proper divisors (3777923).

20581693 is a wasteful number, since it uses less digits than its factorization.

20581693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20581693 is about 4536.7050818849. The cubic root of 20581693 is about 274.0482492686.

The spelling of 20581693 in words is "twenty million, five hundred eighty-one thousand, six hundred ninety-three".