13555520 has 56 divisors (see below), whose sum is σ = 35222688. Its totient is φ = 4928000.

The previous prime is 13555489. The next prime is 13555523. The reversal of 13555520 is 2555531.

13555520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 13555520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595 + ... + 5445.

Almost surely, 2^13555520 is an apocalyptic number.

13555520 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 13555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17611344).

13555520 is an abundant number, since it is smaller than the sum of its proper divisors (21667168).

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

13555520 is a wasteful number, since it uses less digits than its factorization.

13555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879 (or 3869 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 13555520 is about 3681.7821771528. The cubic root of 13555520 is about 238.4361280322.

It can be divided in two parts, 135 and 55520, that added together give a palindrome (55655).

The spelling of 13555520 in words is "thirteen million, five hundred fifty-five thousand, five hundred twenty".