19578420947 has 8 divisors (see below), whose sum is σ = 19620648960. Its totient is φ = 19536228360.

The previous prime is 19578420941. The next prime is 19578421067. The reversal of 19578420947 is 74902487591.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19578420947 - 2⁸ = 19578420691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19578420892 and 19578420901.

It is not an unprimeable number, because it can be changed into a prime (19578420941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299218 + ... + 1314200.

It is an arithmetic number, because the mean of its divisors is an integer number (2452581120).

Almost surely, 2^19578420947 is an apocalyptic number.

19578420947 is a deficient number, since it is larger than the sum of its proper divisors (42228013).

19578420947 is a wasteful number, since it uses less digits than its factorization.

19578420947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17713.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 19578420947 in words is "nineteen billion, five hundred seventy-eight million, four hundred twenty thousand, nine hundred forty-seven".