170161920 has 108 divisors (see below), whose sum is σ = 588782376. Its totient is φ = 45373440.

The previous prime is 170161913. The next prime is 170161939. The reversal of 170161920 is 29161071.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4135 + ... + 18905.

Almost surely, 2^170161920 is an apocalyptic number.

170161920 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 170161920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294391188).

170161920 is an abundant number, since it is smaller than the sum of its proper divisors (418620456).

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

170161920 is a wasteful number, since it uses less digits than its factorization.

170161920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14798 (or 14781 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 170161920 is about 13044.6126811033. The cubic root of 170161920 is about 554.1416485838.

The spelling of 170161920 in words is "one hundred seventy million, one hundred sixty-one thousand, nine hundred twenty".