20018128 has 40 divisors (see below), whose sum is σ = 42103208. Its totient is φ = 9165312.

The previous prime is 20018113. The next prime is 20018161. The reversal of 20018128 is 82181002.

It can be written as a sum of positive squares in 4 ways, for example, as 1459264 + 18558864 = 1208^2 + 4308^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20018099 and 20018108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32350 + ... + 32962.

Almost surely, 2^20018128 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 20018128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21051604).

20018128 is an abundant number, since it is smaller than the sum of its proper divisors (22085080).

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

20018128 is a wasteful number, since it uses less digits than its factorization.

20018128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20018128 is about 4474.1622679559. The cubic root of 20018128 is about 271.5237484978.

The spelling of 20018128 in words is "twenty million, eighteen thousand, one hundred twenty-eight".