20330042 has 4 divisors (see below), whose sum is σ = 30495066. Its totient is φ = 10165020.

The previous prime is 20329993. The next prime is 20330047. The reversal of 20330042 is 24003302.

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., 17986081 + 2343961 = 4241^2 + 1531^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20329999 and 20330026.

It is not an unprimeable number, because it can be changed into a prime (20330047) 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, 5082509 + ... + 5082512.

Almost surely, 2^20330042 is an apocalyptic number.

20330042 is a deficient number, since it is larger than the sum of its proper divisors (10165024).

20330042 is a wasteful number, since it uses less digits than its factorization.

20330042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10165023.

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20330042 is about 4508.8847845116. The cubic root of 20330042 is about 272.9267426331.

Adding to 20330042 its reverse (24003302), we get a palindrome (44333344).

The spelling of 20330042 in words is "twenty million, three hundred thirty thousand, forty-two".