13443820 has 48 divisors (see below), whose sum is σ = 31469760. Its totient is φ = 4790016.

The previous prime is 13443809. The next prime is 13443827. The reversal of 13443820 is 2834431.

13443820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13443827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6649 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (655620).

Almost surely, 2^13443820 is an apocalyptic number.

13443820 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 13443820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15734880).

13443820 is an abundant number, since it is smaller than the sum of its proper divisors (18025940).

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

13443820 is a wasteful number, since it uses less digits than its factorization.

13443820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 13443820 is about 3666.5815141627. The cubic root of 13443820 is about 237.7794015540.

The spelling of 13443820 in words is "thirteen million, four hundred forty-three thousand, eight hundred twenty".