20175428 has 48 divisors (see below), whose sum is σ = 44499840. Its totient is φ = 7789824.

The previous prime is 20175427. The next prime is 20175469. The reversal of 20175428 is 82457102.

It is a self number, because there is not a number n which added to its sum of digits gives 20175428.

It is not an unprimeable number, because it can be changed into a prime (20175427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15008 + ... + 16296.

It is an arithmetic number, because the mean of its divisors is an integer number (927080).

Almost surely, 2^20175428 is an apocalyptic number.

20175428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20175428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22249920).

20175428 is an abundant number, since it is smaller than the sum of its proper divisors (24324412).

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

20175428 is a wasteful number, since it uses less digits than its factorization.

20175428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20175428 is about 4491.7065799092. The cubic root of 20175428 is about 272.2330938753.

The spelling of 20175428 in words is "twenty million, one hundred seventy-five thousand, four hundred twenty-eight".