20159928 has 80 divisors (see below), whose sum is σ = 57629880. Its totient is φ = 6581952.

The previous prime is 20159917. The next prime is 20159929. The reversal of 20159928 is 82995102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20159892 and 20159901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20159929) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34051 + ... + 34637.

Almost surely, 2^20159928 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 20159928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28814940).

20159928 is an abundant number, since it is smaller than the sum of its proper divisors (37469952).

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

20159928 is a wasteful number, since it uses less digits than its factorization.

20159928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20159928 is about 4489.9808462843. The cubic root of 20159928 is about 272.1633606334.

The spelling of 20159928 in words is "twenty million, one hundred fifty-nine thousand, nine hundred twenty-eight".