20478391219 has 8 divisors (see below), whose sum is σ = 24058529712. Its totient is φ = 17184663840.

The previous prime is 20478391217. The next prime is 20478391247. The reversal of 20478391219 is 91219387402.

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 20478391219 - 2¹ = 20478391217 is a prime.

It is a super-2 number, since 2×20478391219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20478391217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71602624 + ... + 71602909.

It is an arithmetic number, because the mean of its divisors is an integer number (3007316214).

Almost surely, 2^20478391219 is an apocalyptic number.

20478391219 is a deficient number, since it is larger than the sum of its proper divisors (3580138493).

20478391219 is a wasteful number, since it uses less digits than its factorization.

20478391219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143205557.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 20478391219 in words is "twenty billion, four hundred seventy-eight million, three hundred ninety-one thousand, two hundred nineteen".