20342242 has 4 divisors (see below), whose sum is σ = 30513366. Its totient is φ = 10171120.

The previous prime is 20342213. The next prime is 20342243. The reversal of 20342242 is 24224302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11215801 + 9126441 = 3349^2 + 3021^2 .

It is not an unprimeable number, because it can be changed into a prime (20342243) 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 as a sum of consecutive naturals, namely, 5085559 + ... + 5085562.

Almost surely, 2^20342242 is an apocalyptic number.

20342242 is a deficient number, since it is larger than the sum of its proper divisors (10171124).

20342242 is a wasteful number, since it uses less digits than its factorization.

20342242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171123.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20342242 is about 4510.2374660321. The cubic root of 20342242 is about 272.9813259018.

Adding to 20342242 its reverse (24224302), we get a palindrome (44566544).

The spelling of 20342242 in words is "twenty million, three hundred forty-two thousand, two hundred forty-two".