20128394 has 16 divisors (see below), whose sum is σ = 35471520. Its totient is φ = 8445360.

The previous prime is 20128387. The next prime is 20128399. The reversal of 20128394 is 49382102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20128399) 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, 34904 + ... + 35475.

It is an arithmetic number, because the mean of its divisors is an integer number (2216970).

Almost surely, 2^20128394 is an apocalyptic number.

20128394 is a deficient number, since it is larger than the sum of its proper divisors (15343126).

20128394 is a wasteful number, since it uses less digits than its factorization.

20128394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70405.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20128394 is about 4486.4678757348. The cubic root of 20128394 is about 272.0213813209.

The spelling of 20128394 in words is "twenty million, one hundred twenty-eight thousand, three hundred ninety-four".