19954893789 has 12 divisors (see below), whose sum is σ = 28825311996. Its totient is φ = 13302534912.

The previous prime is 19954893787. The next prime is 19954893839. The reversal of 19954893789 is 98739845991.

19954893789 is a `hidden beast` number, since 1 + 9 + 9 + 548 + 9 + 3 + 78 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18200708100 + 1754185689 = 134910^2 + 41883^2 .

It is not a de Polignac number, because 19954893789 - 2¹ = 19954893787 is a prime.

It is a super-2 number, since 2×19954893789² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19954893787) 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 11 ways as a sum of consecutive naturals, for example, 152479 + ... + 251315.

It is an arithmetic number, because the mean of its divisors is an integer number (2402109333).

Almost surely, 2^19954893789 is an apocalyptic number.

It is an amenable number.

19954893789 is a deficient number, since it is larger than the sum of its proper divisors (8870418207).

19954893789 is a wasteful number, since it uses less digits than its factorization.

19954893789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121276 (or 121273 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 72.

The spelling of 19954893789 in words is "nineteen billion, nine hundred fifty-four million, eight hundred ninety-three thousand, seven hundred eighty-nine".