19986194120 has 32 divisors (see below), whose sum is σ = 45023784120. Its totient is φ = 7984727040.

The previous prime is 19986194087. The next prime is 19986194167. The reversal of 19986194120 is 2149168991.

It can be written as a sum of positive squares in 4 ways, for example, as 17436146116 + 2550048004 = 132046^2 + 50498^2 .

It is a super-3 number, since 3×19986194120³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271457 + ... + 337136.

Almost surely, 2^19986194120 is an apocalyptic number.

19986194120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19986194120 is an abundant number, since it is smaller than the sum of its proper divisors (25037590000).

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

19986194120 is a wasteful number, since it uses less digits than its factorization.

19986194120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609425 (or 609421 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 19986194120 in words is "nineteen billion, nine hundred eighty-six million, one hundred ninety-four thousand, one hundred twenty".