20408242 has 16 divisors (see below), whose sum is σ = 33012000. Its totient is φ = 9430560.

The previous prime is 20408239. The next prime is 20408243. The reversal of 20408242 is 24280402.

It is not an unprimeable number, because it can be changed into a prime (20408243) 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, 4992 + ... + 8107.

It is an arithmetic number, because the mean of its divisors is an integer number (2063250).

Almost surely, 2^20408242 is an apocalyptic number.

20408242 is a deficient number, since it is larger than the sum of its proper divisors (12603758).

20408242 is a wasteful number, since it uses less digits than its factorization.

20408242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13161.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 20408242 is about 4517.5482288516. The cubic root of 20408242 is about 273.2762346855.

Adding to 20408242 its reverse (24280402), we get a palindrome (44688644).

The spelling of 20408242 in words is "twenty million, four hundred eight thousand, two hundred forty-two".