13565420 has 48 divisors (see below), whose sum is σ = 31334688. Its totient is φ = 4892160.

The previous prime is 13565413. The next prime is 13565441. The reversal of 13565420 is 2456531.

It is a self number, because there is not a number n which added to its sum of digits gives 13565420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43184 + ... + 43496.

It is an arithmetic number, because the mean of its divisors is an integer number (652806).

Almost surely, 2^13565420 is an apocalyptic number.

13565420 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 13565420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15667344).

13565420 is an abundant number, since it is smaller than the sum of its proper divisors (17769268).

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

13565420 is a wasteful number, since it uses less digits than its factorization.

13565420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 13565420 is about 3683.1263893600. The cubic root of 13565420 is about 238.4941595758.

Subtracting from 13565420 its reverse (2456531), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 1356 and 5420, that added together give a palindrome (6776).

The spelling of 13565420 in words is "thirteen million, five hundred sixty-five thousand, four hundred twenty".