20596861 has 4 divisors (see below), whose sum is σ = 20716092. Its totient is φ = 20477632.

The previous prime is 20596847. The next prime is 20596897. The reversal of 20596861 is 16869502.

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 16556761 + 4040100 = 4069^2 + 2010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20596861 - 2⁹ = 20596349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20596861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506861) 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 3 ways as a sum of consecutive naturals, for example, 59356 + ... + 59701.

It is an arithmetic number, because the mean of its divisors is an integer number (5179023).

Almost surely, 2^20596861 is an apocalyptic number.

It is an amenable number.

20596861 is a deficient number, since it is larger than the sum of its proper divisors (119231).

20596861 is a wasteful number, since it uses less digits than its factorization.

20596861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119230.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 20596861 is about 4538.3764718234. The cubic root of 20596861 is about 274.1155541162.

The spelling of 20596861 in words is "twenty million, five hundred ninety-six thousand, eight hundred sixty-one".