165570020 has 72 divisors (see below), whose sum is σ = 441262080. Its totient is φ = 51602880.

The previous prime is 165569959. The next prime is 165570023. The reversal of 165570020 is 20075561.

It is not an unprimeable number, because it can be changed into a prime (165570023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3101 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (6128640).

Almost surely, 2^165570020 is an apocalyptic number.

165570020 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 165570020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220631040).

165570020 is an abundant number, since it is smaller than the sum of its proper divisors (275692060).

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

165570020 is a wasteful number, since it uses less digits than its factorization.

165570020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15393 (or 15384 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 165570020 is about 12867.4014470677. The cubic root of 165570020 is about 549.1115352523. Note that the first 3 decimals are identical.

The spelling of 165570020 in words is "one hundred sixty-five million, five hundred seventy thousand, twenty".