20673172 has 24 divisors (see below), whose sum is σ = 40307400. Its totient is φ = 9211776.

The previous prime is 20673157. The next prime is 20673181. The reversal of 20673172 is 27137602.

It can be written as a sum of positive squares in 4 ways, for example, as 3334276 + 17338896 = 1826^2 + 4164^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20673172.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5347 + ... + 8362.

It is an arithmetic number, because the mean of its divisors is an integer number (1679475).

Almost surely, 2^20673172 is an apocalyptic number.

It is an amenable number.

20673172 is a deficient number, since it is larger than the sum of its proper divisors (19634228).

20673172 is a wasteful number, since it uses less digits than its factorization.

20673172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755 (or 13753 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20673172 is about 4546.7760006405. The cubic root of 20673172 is about 274.4536679588.

The spelling of 20673172 in words is "twenty million, six hundred seventy-three thousand, one hundred seventy-two".