20640708583 has 8 divisors (see below), whose sum is σ = 22518176400. Its totient is φ = 18763414080.

The previous prime is 20640708581. The next prime is 20640708601. The reversal of 20640708583 is 38580704602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20640708583 - 2¹ = 20640708581 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 (20640708581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447141 + ... + 491137.

It is an arithmetic number, because the mean of its divisors is an integer number (2814772050).

Almost surely, 2^20640708583 is an apocalyptic number.

20640708583 is a deficient number, since it is larger than the sum of its proper divisors (1877467817).

20640708583 is a wasteful number, since it uses less digits than its factorization.

20640708583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86657.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 20640708583 in words is "twenty billion, six hundred forty million, seven hundred eight thousand, five hundred eighty-three".