20289172 has 12 divisors (see below), whose sum is σ = 36465940. Its totient is φ = 9870336.

The previous prime is 20289167. The next prime is 20289179. The reversal of 20289172 is 27198202.

It can be written as a sum of positive squares in 2 ways, for example, as 10023556 + 10265616 = 3166^2 + 3204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289179) 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, 68397 + ... + 68692.

Almost surely, 2^20289172 is an apocalyptic number.

It is an amenable number.

20289172 is a deficient number, since it is larger than the sum of its proper divisors (16176768).

20289172 is a wasteful number, since it uses less digits than its factorization.

20289172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137130 (or 137128 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20289172 is about 4504.3503416142. The cubic root of 20289172 is about 272.7437294177.

The spelling of 20289172 in words is "twenty million, two hundred eighty-nine thousand, one hundred seventy-two".