163385220 has 96 divisors (see below), whose sum is σ = 470292480. Its totient is φ = 42365440.

The previous prime is 163385203. The next prime is 163385291. The reversal of 163385220 is 22583361.

163385220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×163385220² = 53389460228896800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 607246 + ... + 607514.

It is an arithmetic number, because the mean of its divisors is an integer number (4898880).

Almost surely, 2^163385220 is an apocalyptic number.

163385220 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 163385220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235146240).

163385220 is an abundant number, since it is smaller than the sum of its proper divisors (306907260).

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

163385220 is a wasteful number, since it uses less digits than its factorization.

163385220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 163385220 is about 12782.2228113893. Note that the first 3 decimals coincide. The cubic root of 163385220 is about 546.6855428408.

The spelling of 163385220 in words is "one hundred sixty-three million, three hundred eighty-five thousand, two hundred twenty".