163556020 has 12 divisors (see below), whose sum is σ = 343467684. Its totient is φ = 65422400.

The previous prime is 163555999. The next prime is 163556023. The reversal of 163556020 is 20655361.

It can be written as a sum of positive squares in 2 ways, for example, as 20466576 + 143089444 = 4524^2 + 11962^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 163556020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163556023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4088881 + ... + 4088920.

It is an arithmetic number, because the mean of its divisors is an integer number (28622307).

Almost surely, 2^163556020 is an apocalyptic number.

163556020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163556020 is an abundant number, since it is smaller than the sum of its proper divisors (179911664).

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

163556020 is a wasteful number, since it uses less digits than its factorization.

163556020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8177810 (or 8177808 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 163556020 is about 12788.9022202846. The cubic root of 163556020 is about 546.8759749425.

The spelling of 163556020 in words is "one hundred sixty-three million, five hundred fifty-six thousand, twenty".