166420 has 24 divisors (see below), whose sum is σ = 358344. Its totient is φ = 64896.

The previous prime is 166417. The next prime is 166429. The reversal of 166420 is 24661.

It can be written as a sum of positive squares in 4 ways, for example, as 17424 + 148996 = 132^2 + 386^2 .

It is a plaindrome in base 15.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166429) 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, 982 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (14931).

2¹⁶⁶⁴²⁰ is an apocalyptic number.

166420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166420 is an abundant number, since it is smaller than the sum of its proper divisors (191924).

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

166420 is a wasteful number, since it uses less digits than its factorization.

166420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 166420 is about 407.9460748677. The cubic root of 166420 is about 55.0049582307.

The spelling of 166420 in words is "one hundred sixty-six thousand, four hundred twenty".