163306220 has 72 divisors (see below), whose sum is σ = 435229200. Its totient is φ = 50897280.

The previous prime is 163306207. The next prime is 163306237. The reversal of 163306220 is 22603361.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3206 + ... + 18354.

It is an arithmetic number, because the mean of its divisors is an integer number (6044850).

Almost surely, 2^163306220 is an apocalyptic number.

163306220 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 163306220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217614600).

163306220 is an abundant number, since it is smaller than the sum of its proper divisors (271922980).

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

163306220 is a wasteful number, since it uses less digits than its factorization.

163306220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15183 (or 15174 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 163306220 is about 12779.1322084091. The cubic root of 163306220 is about 546.5974175287.

Adding to 163306220 its reverse (22603361), we get a palindrome (185909581).

The spelling of 163306220 in words is "one hundred sixty-three million, three hundred six thousand, two hundred twenty".