20191442 has 4 divisors (see below), whose sum is σ = 30287166. Its totient is φ = 10095720.

The previous prime is 20191441. The next prime is 20191459. The reversal of 20191442 is 24419102.

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., 19989841 + 201601 = 4471^2 + 449^2 .

It is not an unprimeable number, because it can be changed into a prime (20191441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5047859 + ... + 5047862.

Almost surely, 2^20191442 is an apocalyptic number.

20191442 is a deficient number, since it is larger than the sum of its proper divisors (10095724).

20191442 is a wasteful number, since it uses less digits than its factorization.

20191442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10095723.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20191442 is about 4493.4888449845. The cubic root of 20191442 is about 272.3051020599.

The spelling of 20191442 in words is "twenty million, one hundred ninety-one thousand, four hundred forty-two".