20268684805 has 4 divisors (see below), whose sum is σ = 24322421772. Its totient is φ = 16214947840.

The previous prime is 20268684773. The next prime is 20268684817. The reversal of 20268684805 is 50848686202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50848686202 = 2 ⋅25424343101.

It can be written as a sum of positive squares in 2 ways, for example, as 3638261124 + 16630423681 = 60318^2 + 128959^2 .

It is not a de Polignac number, because 20268684805 - 2⁵ = 20268684773 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026868476 + ... + 2026868485.

It is an arithmetic number, because the mean of its divisors is an integer number (6080605443).

Almost surely, 2^20268684805 is an apocalyptic number.

It is an amenable number.

20268684805 is a deficient number, since it is larger than the sum of its proper divisors (4053736967).

20268684805 is an equidigital number, since it uses as much as digits as its factorization.

20268684805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053736966.

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 20268684805 in words is "twenty billion, two hundred sixty-eight million, six hundred eighty-four thousand, eight hundred five".