203994381996 has 18 divisors (see below), whose sum is σ = 515652465692. Its totient is φ = 67998127320.

The previous prime is 203994381979. The next prime is 203994382087. The reversal of 203994381996 is 699183499302.

203994381996 is a `hidden beast` number, since 2 + 0 + 3 + 9 + 9 + 438 + 199 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×203994381996² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2833255270 + ... + 2833255341.

Almost surely, 2^203994381996 is an apocalyptic number.

It is an amenable number.

203994381996 is an abundant number, since it is smaller than the sum of its proper divisors (311658083696).

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

203994381996 is a wasteful number, since it uses less digits than its factorization.

203994381996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5666510621 (or 5666510616 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 203994381996 in words is "two hundred three billion, nine hundred ninety-four million, three hundred eighty-one thousand, nine hundred ninety-six".