20394515619 has 6 divisors (see below), whose sum is σ = 29458744796. Its totient is φ = 13596343740.

The previous prime is 20394515573. The next prime is 20394515639. The reversal of 20394515619 is 91651549302.

20394515619 is a `hidden beast` number, since 2 + 0 + 39 + 4 + 51 + 561 + 9 = 666.

It is not a de Polignac number, because 20394515619 - 2¹¹ = 20394513571 is a prime.

It is a super-2 number, since 2×20394515619² (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 (20394515639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1133028637 + ... + 1133028654.

Almost surely, 2^20394515619 is an apocalyptic number.

20394515619 is a deficient number, since it is larger than the sum of its proper divisors (9064229177).

20394515619 is a wasteful number, since it uses less digits than its factorization.

20394515619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266057297 (or 2266057294 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 20394515619 in words is "twenty billion, three hundred ninety-four million, five hundred fifteen thousand, six hundred nineteen".