20130172 has 6 divisors (see below), whose sum is σ = 35227808. Its totient is φ = 10065084.

The previous prime is 20130169. The next prime is 20130179. The reversal of 20130172 is 27103102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2516268 + ... + 2516275.

Almost surely, 2^20130172 is an apocalyptic number.

It is an amenable number.

20130172 is a deficient number, since it is larger than the sum of its proper divisors (15097636).

20130172 is a wasteful number, since it uses less digits than its factorization.

20130172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032547 (or 5032545 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20130172 is about 4486.6660227835. Note that the first 3 decimals coincide. The cubic root of 20130172 is about 272.0293905669.

Adding to 20130172 its reverse (27103102), we get a palindrome (47233274).

It can be divided in two parts, 20130 and 172, that added together give a palindrome (20302).

The spelling of 20130172 in words is "twenty million, one hundred thirty thousand, one hundred seventy-two".