169820 has 24 divisors (see below), whose sum is σ = 407904. Its totient is φ = 58176.

The previous prime is 169817. The next prime is 169823. The reversal of 169820 is 28961.

It is an interprime number because it is at equal distance from previous prime (169817) and next prime (169823).

It is a self number, because there is not a number n which added to its sum of digits gives 169820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467 + ... + 746.

It is an arithmetic number, because the mean of its divisors is an integer number (16996).

2¹⁶⁹⁸²⁰ is an apocalyptic number.

169820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169820 is an abundant number, since it is smaller than the sum of its proper divisors (238084).

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

169820 is a wasteful number, since it uses less digits than its factorization.

169820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 169820 is about 412.0922226881. The cubic root of 169820 is about 55.3770239278.

It can be divided in two parts, 169 and 820, that added together give a palindrome (989).

The spelling of 169820 in words is "one hundred sixty-nine thousand, eight hundred twenty".