13455565020 has 96 divisors (see below), whose sum is σ = 42035864640. Its totient is φ = 3573227520.

The previous prime is 13455565009. The next prime is 13455565021. The reversal of 13455565020 is 2056555431.

13455565020 is a `hidden beast` number, since 1 + 34 + 5 + 556 + 50 + 20 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13455565021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78444 + ... + 181836.

It is an arithmetic number, because the mean of its divisors is an integer number (437873590).

Almost surely, 2^13455565020 is an apocalyptic number.

13455565020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13455565020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21017932320).

13455565020 is an abundant number, since it is smaller than the sum of its proper divisors (28580299620).

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

13455565020 is a wasteful number, since it uses less digits than its factorization.

13455565020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103652 (or 103644 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 13455565020 in words is "thirteen billion, four hundred fifty-five million, five hundred sixty-five thousand, twenty".