13520206420 has 144 divisors (see below), whose sum is σ = 35314755840. Its totient is φ = 4319917056.

The previous prime is 13520206417. The next prime is 13520206433. The reversal of 13520206420 is 2460202531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1712041 + ... + 1719919.

It is an arithmetic number, because the mean of its divisors is an integer number (245241360).

Almost surely, 2^13520206420 is an apocalyptic number.

13520206420 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 13520206420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17657377920).

13520206420 is an abundant number, since it is smaller than the sum of its proper divisors (21794549420).

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

13520206420 is a wasteful number, since it uses less digits than its factorization.

13520206420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022 (or 8013 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 13520206420 its reverse (2460202531), we get a palindrome (15980408951).

The spelling of 13520206420 in words is "thirteen billion, five hundred twenty million, two hundred six thousand, four hundred twenty".