20389042 has 8 divisors (see below), whose sum is σ = 30854556. Its totient is φ = 10104192.

The previous prime is 20389027. The next prime is 20389049. The reversal of 20389042 is 24098302.

It can be written as a sum of positive squares in 2 ways, for example, as 20169081 + 219961 = 4491^2 + 469^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20389042.

It is not an unprimeable number, because it can be changed into a prime (20389049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44883 + ... + 45334.

Almost surely, 2^20389042 is an apocalyptic number.

20389042 is a deficient number, since it is larger than the sum of its proper divisors (10465514).

20389042 is a wasteful number, since it uses less digits than its factorization.

20389042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90332.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20389042 is about 4515.4226823189. The cubic root of 20389042 is about 273.1905086998.

The spelling of 20389042 in words is "twenty million, three hundred eighty-nine thousand, forty-two".