20019999978000 has 240 divisors, whose sum is σ = 76279840670592. Its totient is φ = 4853333280000.

The previous prime is 20019999977981. The next prime is 20019999978001. The reversal of 20019999978000 is 87999991002.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (20019999978001) 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 47 ways as a sum of consecutive naturals, for example, 50357556 + ... + 50753555.

Almost surely, 2^{20019999978000} is an apocalyptic number.

20019999978000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20019999978000 is an abundant number, since it is smaller than the sum of its proper divisors (56259840692592).

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

20019999978000 is a wasteful number, since it uses less digits than its factorization.

20019999978000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101111151 (or 101111132 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 63.

The spelling of 20019999978000 in words is "twenty trillion, nineteen billion, nine hundred ninety-nine million, nine hundred seventy-eight thousand".