20128418 has 8 divisors (see below), whose sum is σ = 30532140. Its totient is φ = 9951040.

The previous prime is 20128411. The next prime is 20128421. The reversal of 20128418 is 81482102.

It can be written as a sum of positive squares in 2 ways, for example, as 19829209 + 299209 = 4453^2 + 547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20128418² = 810306422365448, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20128411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56363 + ... + 56718.

Almost surely, 2^20128418 is an apocalyptic number.

20128418 is a deficient number, since it is larger than the sum of its proper divisors (10403722).

20128418 is a wasteful number, since it uses less digits than its factorization.

20128418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113172.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 20128418 is about 4486.4705504439. The cubic root of 20128418 is about 272.0214894354.

The spelling of 20128418 in words is "twenty million, one hundred twenty-eight thousand, four hundred eighteen".