20127172 has 24 divisors (see below), whose sum is σ = 38367000. Its totient is φ = 9182976.

The previous prime is 20127169. The next prime is 20127181. The reversal of 20127172 is 27172102.

It can be written as a sum of positive squares in 4 ways, for example, as 1602756 + 18524416 = 1266^2 + 4304^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2454 + ... + 6802.

It is an arithmetic number, because the mean of its divisors is an integer number (1598625).

Almost surely, 2^20127172 is an apocalyptic number.

It is an amenable number.

20127172 is a deficient number, since it is larger than the sum of its proper divisors (18239828).

20127172 is a wasteful number, since it uses less digits than its factorization.

20127172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455 (or 4453 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 20127172 is about 4486.3316863558. The cubic root of 20127172 is about 272.0158763801.

Adding to 20127172 its reverse (27172102), we get a palindrome (47299274).

The spelling of 20127172 in words is "twenty million, one hundred twenty-seven thousand, one hundred seventy-two".