20791520803 has 4 divisors (see below), whose sum is σ = 20791906528. Its totient is φ = 20791135080.

The previous prime is 20791520719. The next prime is 20791520807. The reversal of 20791520803 is 30802519702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20791520803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20791520807) 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, 95688 + ... + 225253.

It is an arithmetic number, because the mean of its divisors is an integer number (5197976632).

Almost surely, 2^20791520803 is an apocalyptic number.

20791520803 is a deficient number, since it is larger than the sum of its proper divisors (385725).

20791520803 is an equidigital number, since it uses as much as digits as its factorization.

20791520803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385724.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 20791520803 in words is "twenty billion, seven hundred ninety-one million, five hundred twenty thousand, eight hundred three".