16135220 has 12 divisors (see below), whose sum is σ = 33884004. Its totient is φ = 6454080.

The previous prime is 16135201. The next prime is 16135253. The reversal of 16135220 is 2253161.

16135220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4218916 + 11916304 = 2054^2 + 3452^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 806761 = 16135220 / (1 + 6 + 1 + 3 + 5 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 16135192 and 16135201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403361 + ... + 403400.

It is an arithmetic number, because the mean of its divisors is an integer number (2823667).

Almost surely, 2^16135220 is an apocalyptic number.

16135220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16135220 is an abundant number, since it is smaller than the sum of its proper divisors (17748784).

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

16135220 is a wasteful number, since it uses less digits than its factorization.

16135220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806770 (or 806768 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 16135220 is about 4016.8669382991. The cubic root of 16135220 is about 252.6920800974.

Adding to 16135220 its reverse (2253161), we get a palindrome (18388381).

The spelling of 16135220 in words is "sixteen million, one hundred thirty-five thousand, two hundred twenty".