20553444021520 has 40 divisors (see below), whose sum is σ = 48952288024920. Its totient is φ = 8020856202240.

The previous prime is 20553444021503. The next prime is 20553444021557. The reversal of 20553444021520 is 2512044435502.

It can be written as a sum of positive squares in 4 ways, for example, as 2319553368064 + 18233890653456 = 1523008^2 + 4270116^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20553444021520² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20553444021520.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3133143675 + ... + 3133150234.

It is an arithmetic number, because the mean of its divisors is an integer number (1223807200623).

Almost surely, 2^{20553444021520} is an apocalyptic number.

20553444021520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553444021520 is an abundant number, since it is smaller than the sum of its proper divisors (28398844003400).

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

20553444021520 is a wasteful number, since it uses less digits than its factorization.

20553444021520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6266293963 (or 6266293957 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 37.

The spelling of 20553444021520 in words is "twenty trillion, five hundred fifty-three billion, four hundred forty-four million, twenty-one thousand, five hundred twenty".