20844189648 has 80 divisors (see below), whose sum is σ = 60094397760. Its totient is φ = 6917422464.

The previous prime is 20844189643. The next prime is 20844189683. The reversal of 20844189648 is 84698144802.

It is a happy number.

20844189648 is a `hidden beast` number, since 20 + 84 + 418 + 96 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20844189594 and 20844189603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844189643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8215 + ... + 204342.

It is an arithmetic number, because the mean of its divisors is an integer number (751179972).

Almost surely, 2^20844189648 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 20844189648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30047198880).

20844189648 is an abundant number, since it is smaller than the sum of its proper divisors (39250208112).

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

20844189648 is a wasteful number, since it uses less digits than its factorization.

20844189648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212801 (or 212789 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 20844189648 in words is "twenty billion, eight hundred forty-four million, one hundred eighty-nine thousand, six hundred forty-eight".