20555511444 has 144 divisors (see below), whose sum is σ = 59349850560. Its totient is φ = 5942522880.

The previous prime is 20555511443. The next prime is 20555511463. The reversal of 20555511444 is 44411555502.

20555511444 is a `hidden beast` number, since 2 + 0 + 55 + 551 + 14 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20555511399 and 20555511408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555511443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5495727 + ... + 5499465.

It is an arithmetic number, because the mean of its divisors is an integer number (412151740).

Almost surely, 2^20555511444 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 20555511444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29674925280).

20555511444 is an abundant number, since it is smaller than the sum of its proper divisors (38794339116).

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

20555511444 is a wasteful number, since it uses less digits than its factorization.

20555511444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470 (or 4465 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 20555511444 in words is "twenty billion, five hundred fifty-five million, five hundred eleven thousand, four hundred forty-four".