20331442 has 4 divisors (see below), whose sum is σ = 30497166. Its totient is φ = 10165720.

The previous prime is 20331419. The next prime is 20331461. The reversal of 20331442 is 24413302.

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., 20331081 + 361 = 4509^2 + 19^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5082859 + ... + 5082862.

Almost surely, 2^20331442 is an apocalyptic number.

20331442 is a deficient number, since it is larger than the sum of its proper divisors (10165724).

20331442 is a wasteful number, since it uses less digits than its factorization.

20331442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10165723.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20331442 is about 4509.0400308713. The cubic root of 20331442 is about 272.9330073959.

Adding to 20331442 its reverse (24413302), we get a palindrome (44744744).

The spelling of 20331442 in words is "twenty million, three hundred thirty-one thousand, four hundred forty-two".