165620120 has 48 divisors (see below), whose sum is σ = 395882640. Its totient is φ = 62346752.

The previous prime is 165620101. The next prime is 165620123. The reversal of 165620120 is 21026561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165620123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4397 + ... + 18723.

It is an arithmetic number, because the mean of its divisors is an integer number (8247555).

Almost surely, 2^165620120 is an apocalyptic number.

165620120 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 165620120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197941320).

165620120 is an abundant number, since it is smaller than the sum of its proper divisors (230262520).

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

165620120 is a wasteful number, since it uses less digits than its factorization.

165620120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14372 (or 14351 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 165620120 is about 12869.3480798368. The cubic root of 165620120 is about 549.1669150720.

Adding to 165620120 its reverse (21026561), we get a palindrome (186646681).

The spelling of 165620120 in words is "one hundred sixty-five million, six hundred twenty thousand, one hundred twenty".