20570165 has 48 divisors (see below), whose sum is σ = 32489856. Its totient is φ = 12144000.

The previous prime is 20570117. The next prime is 20570167. The reversal of 20570165 is 56107502.

It is not a de Polignac number, because 20570165 - 2⁶ = 20570101 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570167) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203615 + ... + 203715.

It is an arithmetic number, because the mean of its divisors is an integer number (676872).

Almost surely, 2^20570165 is an apocalyptic number.

It is an amenable number.

20570165 is a deficient number, since it is larger than the sum of its proper divisors (11919691).

20570165 is a wasteful number, since it uses less digits than its factorization.

20570165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 147 counting only the distinct ones).

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

The square root of 20570165 is about 4535.4343783148. The cubic root of 20570165 is about 273.9970740448.

Adding to 20570165 its reverse (56107502), we get a palindrome (76677667).

The spelling of 20570165 in words is "twenty million, five hundred seventy thousand, one hundred sixty-five".