20173428 has 48 divisors (see below), whose sum is σ = 57059520. Its totient is φ = 6112800.

The previous prime is 20173427. The next prime is 20173453. The reversal of 20173428 is 82437102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20173423) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7303 + ... + 9678.

It is an arithmetic number, because the mean of its divisors is an integer number (1188740).

Almost surely, 2^20173428 is an apocalyptic number.

It is an amenable number.

20173428 is an abundant number, since it is smaller than the sum of its proper divisors (36886092).

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

20173428 is a wasteful number, since it uses less digits than its factorization.

20173428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17005 (or 16997 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20173428 is about 4491.4839418615. The cubic root of 20173428 is about 272.2240980450.

It can be divided in two parts, 2017 and 3428, that added together give a palindrome (5445).

The spelling of 20173428 in words is "twenty million, one hundred seventy-three thousand, four hundred twenty-eight".