20128242 has 8 divisors (see below), whose sum is σ = 40256496. Its totient is φ = 6709412.

The previous prime is 20128223. The next prime is 20128279. The reversal of 20128242 is 24282102.

It is a happy number.

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

20128242 is an admirable number.

It is a super-2 number, since 2×20128242² = 810292252021128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677348 + ... + 1677359.

It is an arithmetic number, because the mean of its divisors is an integer number (5032062).

Almost surely, 2^20128242 is an apocalyptic number.

20128242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20128242 is a wasteful number, since it uses less digits than its factorization.

20128242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354712.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 20128242 is about 4486.4509358735. The cubic root of 20128242 is about 272.0206965941.

The spelling of 20128242 in words is "twenty million, one hundred twenty-eight thousand, two hundred forty-two".