20605242 has 32 divisors (see below), whose sum is σ = 47480832. Its totient is φ = 5839344.

The previous prime is 20605229. The next prime is 20605267. The reversal of 20605242 is 24250602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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, 3403 + ... + 7265.

It is an arithmetic number, because the mean of its divisors is an integer number (1483776).

Almost surely, 2^20605242 is an apocalyptic number.

20605242 is an abundant number, since it is smaller than the sum of its proper divisors (26875590).

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

20605242 is a wasteful number, since it uses less digits than its factorization.

20605242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20605242 is about 4539.2997257286. The cubic root of 20605242 is about 274.1527288897.

Adding to 20605242 its reverse (24250602), we get a palindrome (44855844).

The spelling of 20605242 in words is "twenty million, six hundred five thousand, two hundred forty-two".