13556020 has 24 divisors (see below), whose sum is σ = 28665000. Its totient is φ = 5384832.

The previous prime is 13555999. The next prime is 13556029. The reversal of 13556020 is 2065531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 682276 + 12873744 = 826^2 + 3588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13555982 and 13556000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13556029) 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 7 ways as a sum of consecutive naturals, for example, 706 + ... + 5254.

It is an arithmetic number, because the mean of its divisors is an integer number (1194375).

Almost surely, 2^13556020 is an apocalyptic number.

13556020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13556020 is an abundant number, since it is smaller than the sum of its proper divisors (15108980).

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

13556020 is a wasteful number, since it uses less digits than its factorization.

13556020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707 (or 4705 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 13556020 is about 3681.8500784252. The cubic root of 13556020 is about 238.4390595956.

The spelling of 13556020 in words is "thirteen million, five hundred fifty-six thousand, twenty".