20288172 has 12 divisors (see below), whose sum is σ = 47339096. Its totient is φ = 6762720.

The previous prime is 20288171. The next prime is 20288183. The reversal of 20288172 is 27188202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20288171) 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, 845329 + ... + 845352.

Almost surely, 2^20288172 is an apocalyptic number.

It is an amenable number.

20288172 is an abundant number, since it is smaller than the sum of its proper divisors (27050924).

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

20288172 is a wasteful number, since it uses less digits than its factorization.

20288172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690688 (or 1690686 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20288172 is about 4504.2393364474. The cubic root of 20288172 is about 272.7392484034.

Adding to 20288172 its sum of digits (30), we get a palindrome (20288202).

The spelling of 20288172 in words is "twenty million, two hundred eighty-eight thousand, one hundred seventy-two".