20358928 has 60 divisors (see below), whose sum is σ = 43741620. Its totient is φ = 9146368.

The previous prime is 20358901. The next prime is 20358929. The reversal of 20358928 is 82985302.

It can be written as a sum of positive squares in 6 ways, for example, as 784 + 20358144 = 28^2 + 4512^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20358929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228708 + ... + 228796.

It is an arithmetic number, because the mean of its divisors is an integer number (729027).

Almost surely, 2^20358928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20358928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21870810).

20358928 is an abundant number, since it is smaller than the sum of its proper divisors (23382692).

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

20358928 is a wasteful number, since it uses less digits than its factorization.

20358928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20358928 is about 4512.0868785962. The cubic root of 20358928 is about 273.0559443820.

The spelling of 20358928 in words is "twenty million, three hundred fifty-eight thousand, nine hundred twenty-eight".