20841166787 has 8 divisors (see below), whose sum is σ = 23913372672. Its totient is φ = 17792685000.

The previous prime is 20841166777. The next prime is 20841166799. The reversal of 20841166787 is 78766114802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20841166787 - 2²⁸ = 20572731331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20841166727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5929139 + ... + 5932652.

It is an arithmetic number, because the mean of its divisors is an integer number (2989171584).

Almost surely, 2^20841166787 is an apocalyptic number.

20841166787 is a deficient number, since it is larger than the sum of its proper divisors (3072205885).

20841166787 is a wasteful number, since it uses less digits than its factorization.

20841166787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11862049.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 20841166787 in words is "twenty billion, eight hundred forty-one million, one hundred sixty-six thousand, seven hundred eighty-seven".