20659725803 has 4 divisors (see below), whose sum is σ = 20660200488. Its totient is φ = 20659251120.

The previous prime is 20659725761. The next prime is 20659725809. The reversal of 20659725803 is 30852795602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30852795602 = 2 ⋅15426397801.

It is a cyclic number.

It is not a de Polignac number, because 20659725803 - 2⁶ = 20659725739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20659725809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164633 + ... + 261578.

It is an arithmetic number, because the mean of its divisors is an integer number (5165050122).

Almost surely, 2^20659725803 is an apocalyptic number.

20659725803 is a deficient number, since it is larger than the sum of its proper divisors (474685).

20659725803 is an equidigital number, since it uses as much as digits as its factorization.

20659725803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474684.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 20659725803 in words is "twenty billion, six hundred fifty-nine million, seven hundred twenty-five thousand, eight hundred three".