20841162785 has 4 divisors (see below), whose sum is σ = 25009395348. Its totient is φ = 16672930224.

The previous prime is 20841162743. The next prime is 20841162791. The reversal of 20841162785 is 58726114802.

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 5205911104 + 15635251681 = 72152^2 + 125041^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841162785 - 2¹⁴ = 20841146401 is a prime.

It is a Duffinian 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, 2084116274 + ... + 2084116283.

It is an arithmetic number, because the mean of its divisors is an integer number (6252348837).

Almost surely, 2^20841162785 is an apocalyptic number.

It is an amenable number.

20841162785 is a deficient number, since it is larger than the sum of its proper divisors (4168232563).

20841162785 is an equidigital number, since it uses as much as digits as its factorization.

20841162785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168232562.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 20841162785 in words is "twenty billion, eight hundred forty-one million, one hundred sixty-two thousand, seven hundred eighty-five".