16061220 has 144 divisors (see below), whose sum is σ = 58222080. Its totient is φ = 3665088.

The previous prime is 16061197. The next prime is 16061233. The reversal of 16061220 is 2216061.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 16061193 and 16061202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26157 + ... + 26763.

It is an arithmetic number, because the mean of its divisors is an integer number (404320).

Almost surely, 2^16061220 is an apocalyptic number.

16061220 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 16061220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29111040).

16061220 is an abundant number, since it is smaller than the sum of its proper divisors (42160860).

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

16061220 is a wasteful number, since it uses less digits than its factorization.

16061220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16061220 is about 4007.6451938763. The cubic root of 16061220 is about 252.3051858096.

Adding to 16061220 its reverse (2216061), we get a palindrome (18277281).

The spelling of 16061220 in words is "sixteen million, sixty-one thousand, two hundred twenty".