20090172 has 12 divisors (see below), whose sum is σ = 46877096. Its totient is φ = 6696720.

The previous prime is 20090143. The next prime is 20090173. The reversal of 20090172 is 27109002.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090173) 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, 837079 + ... + 837102.

Almost surely, 2^20090172 is an apocalyptic number.

It is an amenable number.

20090172 is an abundant number, since it is smaller than the sum of its proper divisors (26786924).

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

20090172 is a wasteful number, since it uses less digits than its factorization.

20090172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674188 (or 1674186 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20090172 is about 4482.2061532241. The cubic root of 20090172 is about 271.8490908855.

Adding to 20090172 its reverse (27109002), we get a palindrome (47199174).

The spelling of 20090172 in words is "twenty million, ninety thousand, one hundred seventy-two".