163920520 has 64 divisors (see below), whose sum is σ = 378846720. Its totient is φ = 63807744.

The previous prime is 163920509. The next prime is 163920521. The reversal of 163920520 is 25029361.

It is not an unprimeable number, because it can be changed into a prime (163920521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353809 + ... + 354271.

It is an arithmetic number, because the mean of its divisors is an integer number (5919480).

Almost surely, 2^163920520 is an apocalyptic number.

163920520 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 163920520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189423360).

163920520 is an abundant number, since it is smaller than the sum of its proper divisors (214926200).

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

163920520 is a wasteful number, since it uses less digits than its factorization.

163920520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 690 counting only the distinct ones).

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

The square root of 163920520 is about 12803.1449261500. The cubic root of 163920520 is about 547.2819284012.

Adding to 163920520 its reverse (25029361), we get a palindrome (188949881).

The spelling of 163920520 in words is "one hundred sixty-three million, nine hundred twenty thousand, five hundred twenty".