20013172 has 12 divisors (see below), whose sum is σ = 35060256. Its totient is φ = 9995960.

The previous prime is 20013127. The next prime is 20013179. The reversal of 20013172 is 27131002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2847 + ... + 6937.

It is an arithmetic number, because the mean of its divisors is an integer number (2921688).

Almost surely, 2^20013172 is an apocalyptic number.

It is an amenable number.

20013172 is a deficient number, since it is larger than the sum of its proper divisors (15047084).

20013172 is a wasteful number, since it uses less digits than its factorization.

20013172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318 (or 5316 counting only the distinct ones).

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

The square root of 20013172 is about 4473.6083869735. The cubic root of 20013172 is about 271.5013390969.

Adding to 20013172 its reverse (27131002), we get a palindrome (47144174).

The spelling of 20013172 in words is "twenty million, thirteen thousand, one hundred seventy-two".