20454242 has 4 divisors (see below), whose sum is σ = 30681366. Its totient is φ = 10227120.

The previous prime is 20454233. The next prime is 20454257. The reversal of 20454242 is 24245402.

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., 13169641 + 7284601 = 3629^2 + 2699^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5113559 + ... + 5113562.

Almost surely, 2^20454242 is an apocalyptic number.

20454242 is a deficient number, since it is larger than the sum of its proper divisors (10227124).

20454242 is a wasteful number, since it uses less digits than its factorization.

20454242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10227123.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 20454242 is about 4522.6366203798. The cubic root of 20454242 is about 273.4814013669.

Adding to 20454242 its reverse (24245402), we get a palindrome (44699644).

The spelling of 20454242 in words is "twenty million, four hundred fifty-four thousand, two hundred forty-two".