20216128 has 42 divisors (see below), whose sum is σ = 42653966. Its totient is φ = 9504768.

The previous prime is 20216099. The next prime is 20216137. The reversal of 20216128 is 82161202.

It can be written as a sum of positive squares in 3 ways, for example, as 14684224 + 5531904 = 3832^2 + 2352^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20216099 and 20216108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17950 + ... + 19042.

Almost surely, 2^20216128 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 20216128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21326983).

20216128 is an abundant number, since it is smaller than the sum of its proper divisors (22437838).

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

20216128 is a wasteful number, since it uses less digits than its factorization.

20216128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20216128 is about 4496.2348693101. The cubic root of 20216128 is about 272.4160300151.

The spelling of 20216128 in words is "twenty million, two hundred sixteen thousand, one hundred twenty-eight".