19906429438900 has 36 divisors (see below), whose sum is σ = 43197230973708. Its totient is φ = 7962520330240.

The previous prime is 19906429438897. The next prime is 19906429438991. The reversal of 19906429438900 is 983492460991.

It can be written as a sum of positive squares in 6 ways, for example, as 1732723876 + 19904696715024 = 41626^2 + 4461468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17442612 + ... + 18548788.

It is an arithmetic number, because the mean of its divisors is an integer number (1199923082603).

Almost surely, 2^{19906429438900} is an apocalyptic number.

19906429438900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19906429438900 is an abundant number, since it is smaller than the sum of its proper divisors (23290801534808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19906429438900 is a wasteful number, since it uses less digits than its factorization.

19906429438900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286148 (or 1286141 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 64.

The spelling of 19906429438900 in words is "nineteen trillion, nine hundred six billion, four hundred twenty-nine million, four hundred thirty-eight thousand, nine hundred".