20205042 has 32 divisors (see below), whose sum is σ = 47476800. Its totient is φ = 5651520.

The previous prime is 20205041. The next prime is 20205077. The reversal of 20205042 is 24050202.

It is not an unprimeable number, because it can be changed into a prime (20205041) 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 15 ways as a sum of consecutive naturals, for example, 10917 + ... + 12632.

It is an arithmetic number, because the mean of its divisors is an integer number (1483650).

Almost surely, 2^20205042 is an apocalyptic number.

20205042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20205042 is an abundant number, since it is smaller than the sum of its proper divisors (27271758).

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

20205042 is a wasteful number, since it uses less digits than its factorization.

20205042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23578.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20205042 is about 4495.0018909896. The cubic root of 20205042 is about 272.3662256163.

Adding to 20205042 its reverse (24050202), we get a palindrome (44255244).

The spelling of 20205042 in words is "twenty million, two hundred five thousand, forty-two".