19420365442 has 4 divisors (see below), whose sum is σ = 29130548166. Its totient is φ = 9710182720.

The previous prime is 19420365413. The next prime is 19420365451. The reversal of 19420365442 is 24456302491.

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: 24456302491 = 937 ⋅26100643.

It can be written as a sum of positive squares in only one way, i.e., 14553768321 + 4866597121 = 120639^2 + 69761^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 19420365395 and 19420365404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4855091359 + ... + 4855091362.

Almost surely, 2^19420365442 is an apocalyptic number.

19420365442 is a deficient number, since it is larger than the sum of its proper divisors (9710182724).

19420365442 is an equidigital number, since it uses as much as digits as its factorization.

19420365442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9710182723.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 19420365442 in words is "nineteen billion, four hundred twenty million, three hundred sixty-five thousand, four hundred forty-two".