20704242 has 32 divisors (see below), whose sum is σ = 45638208. Its totient is φ = 6221376.

The previous prime is 20704219. The next prime is 20704253. The reversal of 20704242 is 24240702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268 + ... + 6440.

It is an arithmetic number, because the mean of its divisors is an integer number (1426194).

Almost surely, 2^20704242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20704242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22819104).

20704242 is an abundant number, since it is smaller than the sum of its proper divisors (24933966).

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

20704242 is a wasteful number, since it uses less digits than its factorization.

20704242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6234.

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20704242 is about 4550.1914245447. The cubic root of 20704242 is about 274.5910925576.

Adding to 20704242 its reverse (24240702), we get a palindrome (44944944).

The spelling of 20704242 in words is "twenty million, seven hundred four thousand, two hundred forty-two".