13239820 has 36 divisors (see below), whose sum is σ = 30566592. Its totient is φ = 4813600.

The previous prime is 13239781. The next prime is 13239823. The reversal of 13239820 is 2893231.

It is not an unprimeable number, because it can be changed into a prime (13239823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316 + ... + 5155.

It is an arithmetic number, because the mean of its divisors is an integer number (849072).

Almost surely, 2^13239820 is an apocalyptic number.

13239820 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 13239820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15283296).

13239820 is an abundant number, since it is smaller than the sum of its proper divisors (17326772).

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

13239820 is a wasteful number, since it uses less digits than its factorization.

13239820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502 (or 5489 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 13239820 is about 3638.6563454110. The cubic root of 13239820 is about 236.5705576389.

The spelling of 13239820 in words is "thirteen million, two hundred thirty-nine thousand, eight hundred twenty".