20844791161812 has 144 divisors (see below), whose sum is σ = 54269051316480. Its totient is φ = 6742025625600.

The previous prime is 20844791161793. The next prime is 20844791161829. The reversal of 20844791161812 is 21816119744802.

It is a happy number.

20844791161812 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 4 + 7 + 9 + 1 + 1 + 618 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1817167237 + ... + 1817178707.

It is an arithmetic number, because the mean of its divisors is an integer number (376868411920).

Almost surely, 2^{20844791161812} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20844791161812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27134525658240).

20844791161812 is an abundant number, since it is smaller than the sum of its proper divisors (33424260154668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20844791161812 is a wasteful number, since it uses less digits than its factorization.

20844791161812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18094 (or 18089 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 20844791161812 in words is "twenty trillion, eight hundred forty-four billion, seven hundred ninety-one million, one hundred sixty-one thousand, eight hundred twelve".