20530170 has 24 divisors (see below), whose sum is σ = 53378676. Its totient is φ = 5474688.

The previous prime is 20530163. The next prime is 20530177. The reversal of 20530170 is 7103502.

It is an interprime number because it is at equal distance from previous prime (20530163) and next prime (20530177).

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 576081 = 4467^2 + 759^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20530177) 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, 113967 + ... + 114146.

Almost surely, 2^20530170 is an apocalyptic number.

20530170 is an abundant number, since it is smaller than the sum of its proper divisors (32848506).

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

20530170 is a wasteful number, since it uses less digits than its factorization.

20530170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228126 (or 228123 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20530170 is about 4531.0230632827. The cubic root of 20530170 is about 273.8193794250.

Adding to 20530170 its reverse (7103502), we get a palindrome (27633672).

The spelling of 20530170 in words is "twenty million, five hundred thirty thousand, one hundred seventy".