20156928 has 80 divisors (see below), whose sum is σ = 58630176. Its totient is φ = 6103040.

The previous prime is 20156923. The next prime is 20156933. The reversal of 20156928 is 82965102.

It is an interprime number because it is at equal distance from previous prime (20156923) and next prime (20156933).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20156921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16300 + ... + 17492.

Almost surely, 2^20156928 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 20156928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29315088).

20156928 is an abundant number, since it is smaller than the sum of its proper divisors (38473248).

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

20156928 is a wasteful number, since it uses less digits than its factorization.

20156928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20156928 is about 4489.6467567059. The cubic root of 20156928 is about 272.1498597487.

The spelling of 20156928 in words is "twenty million, one hundred fifty-six thousand, nine hundred twenty-eight".