159820 has 24 divisors (see below), whose sum is σ = 343728. Its totient is φ = 62400.

The previous prime is 159811. The next prime is 159833. The reversal of 159820 is 28951.

It is an unprimeable number.

159820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155 + ... + 1285.

It is an arithmetic number, because the mean of its divisors is an integer number (14322).

2¹⁵⁹⁸²⁰ is an apocalyptic number.

159820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159820 is an abundant number, since it is smaller than the sum of its proper divisors (183908).

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

159820 is a wasteful number, since it uses less digits than its factorization.

159820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 159820 is about 399.7749366831. The cubic root of 159820 is about 54.2679865607.

It can be divided in two parts, 159 and 820, that added together give a palindrome (979).

The spelling of 159820 in words is "one hundred fifty-nine thousand, eight hundred twenty".