20389242 has 16 divisors (see below), whose sum is σ = 42924960. Its totient is φ = 6438672.

The previous prime is 20389231. The next prime is 20389249. The reversal of 20389242 is 24298302.

It is not an unprimeable number, because it can be changed into a prime (20389249) 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, 89313 + ... + 89540.

It is an arithmetic number, because the mean of its divisors is an integer number (2682810).

Almost surely, 2^20389242 is an apocalyptic number.

20389242 is an abundant number, since it is smaller than the sum of its proper divisors (22535718).

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

20389242 is a wasteful number, since it uses less digits than its factorization.

20389242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178877.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20389242 is about 4515.4448285856. Note that the first 3 decimals coincide. The cubic root of 20389242 is about 273.1914019561.

The spelling of 20389242 in words is "twenty million, three hundred eighty-nine thousand, two hundred forty-two".