20944178222781 has 64 divisors (see below), whose sum is σ = 32842200508416. Its totient is φ = 11731200768000.

The previous prime is 20944178222771. The next prime is 20944178222791. The reversal of 20944178222781 is 18722287144902.

It is an interprime number because it is at equal distance from previous prime (20944178222771) and next prime (20944178222791).

It is not a de Polignac number, because 20944178222781 - 2⁶ = 20944178222717 is a prime.

It is a super-2 number, since 2×20944178222781² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20944178222701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8169856 + ... + 10422806.

It is an arithmetic number, because the mean of its divisors is an integer number (513159382944).

Almost surely, 2^{20944178222781} is an apocalyptic number.

It is an amenable number.

20944178222781 is a deficient number, since it is larger than the sum of its proper divisors (11898022285635).

20944178222781 is a wasteful number, since it uses less digits than its factorization.

20944178222781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253282.

The product of its (nonzero) digits is 7225344, while the sum is 57.

The spelling of 20944178222781 in words is "twenty trillion, nine hundred forty-four billion, one hundred seventy-eight million, two hundred twenty-two thousand, seven hundred eighty-one".