20844578984055 has 32 divisors (see below), whose sum is σ = 35320807724544. Its totient is φ = 10475043444096.

The previous prime is 20844578983933. The next prime is 20844578984059. The reversal of 20844578984055 is 55048987544802.

It is not a de Polignac number, because 20844578984055 - 2⁸ = 20844578983799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844578984059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450865464 + ... + 450911693.

It is an arithmetic number, because the mean of its divisors is an integer number (1103775241392).

Almost surely, 2^{20844578984055} is an apocalyptic number.

20844578984055 is a deficient number, since it is larger than the sum of its proper divisors (14476228740489).

20844578984055 is a wasteful number, since it uses less digits than its factorization.

20844578984055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901777255.

The product of its (nonzero) digits is 516096000, while the sum is 69.

The spelling of 20844578984055 in words is "twenty trillion, eight hundred forty-four billion, five hundred seventy-eight million, nine hundred eighty-four thousand, fifty-five".