19906429438964 has 12 divisors (see below), whose sum is σ = 34843534899264. Its totient is φ = 9951133753464.

The previous prime is 19906429438897. The next prime is 19906429438991. The reversal of 19906429438964 is 46983492460991.

It is a junction number, because it is equal to n+sod(n) for n = 19906429438891 and 19906429438900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520219982 + ... + 520258245.

It is an arithmetic number, because the mean of its divisors is an integer number (2903627908272).

Almost surely, 2^{19906429438964} is an apocalyptic number.

It is an amenable number.

19906429438964 is a deficient number, since it is larger than the sum of its proper divisors (14937105460300).

19906429438964 is a wasteful number, since it uses less digits than its factorization.

19906429438964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040483014 (or 1040483012 counting only the distinct ones).

The product of its (nonzero) digits is 725594112, while the sum is 74.

The spelling of 19906429438964 in words is "nineteen trillion, nine hundred six billion, four hundred twenty-nine million, four hundred thirty-eight thousand, nine hundred sixty-four".