20004242 has 4 divisors (see below), whose sum is σ = 30006366. Its totient is φ = 10002120.

The previous prime is 20004239. The next prime is 20004253. The reversal of 20004242 is 24240002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24240002 = 2 ⋅12120001.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 4330561 = 3959^2 + 2081^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001059 + ... + 5001062.

Almost surely, 2^20004242 is an apocalyptic number.

20004242 is a deficient number, since it is larger than the sum of its proper divisors (10002124).

20004242 is a wasteful number, since it uses less digits than its factorization.

20004242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002123.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20004242 is about 4472.6101998721. The cubic root of 20004242 is about 271.4609512354.

Adding to 20004242 its reverse (24240002), we get a palindrome (44244244).

The spelling of 20004242 in words is "twenty million, four thousand, two hundred forty-two".