16361220 has 48 divisors (see below), whose sum is σ = 47396160. Its totient is φ = 4212096.

The previous prime is 16361179. The next prime is 16361239. The reversal of 16361220 is 2216361.

It is a happy number.

16361220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2962 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (987420).

Almost surely, 2^16361220 is an apocalyptic number.

16361220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16361220 is an abundant number, since it is smaller than the sum of its proper divisors (31034940).

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

16361220 is a wasteful number, since it uses less digits than its factorization.

16361220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444 (or 9442 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 16361220 is about 4044.9004932136. The cubic root of 16361220 is about 253.8664021427.

Adding to 16361220 its reverse (2216361), we get a palindrome (18577581).

The spelling of 16361220 in words is "sixteen million, three hundred sixty-one thousand, two hundred twenty".