15963220 has 96 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 5023872.

The previous prime is 15963209. The next prime is 15963239. The reversal of 15963220 is 2236951.

15963220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89091 + ... + 89269.

It is an arithmetic number, because the mean of its divisors is an integer number (441000).

Almost surely, 2^15963220 is an apocalyptic number.

15963220 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 15963220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21168000).

15963220 is an abundant number, since it is smaller than the sum of its proper divisors (26372780).

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

15963220 is a wasteful number, since it uses less digits than its factorization.

15963220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 15963220 is about 3995.3998548331. The cubic root of 15963220 is about 251.7909789391.

The spelling of 15963220 in words is "fifteen million, nine hundred sixty-three thousand, two hundred twenty".