20065873505 has 4 divisors (see below), whose sum is σ = 24079048212. Its totient is φ = 16052698800.

The previous prime is 20065873447. The next prime is 20065873507. The reversal of 20065873505 is 50537856002.

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 12173150224 + 7892723281 = 110332^2 + 88841^2 .

It is not a de Polignac number, because 20065873505 - 2⁶ = 20065873441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20065873507) 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, 2006587346 + ... + 2006587355.

It is an arithmetic number, because the mean of its divisors is an integer number (6019762053).

Almost surely, 2^20065873505 is an apocalyptic number.

It is an amenable number.

20065873505 is a deficient number, since it is larger than the sum of its proper divisors (4013174707).

20065873505 is an equidigital number, since it uses as much as digits as its factorization.

20065873505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013174706.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20065873505 in words is "twenty billion, sixty-five million, eight hundred seventy-three thousand, five hundred five".