19992420000 has 1200 divisors, whose sum is σ = 88017475392. Its totient is φ = 4354560000.

The previous prime is 19992419981. The next prime is 19992420013. The reversal of 19992420000 is 2429991.

It is a tau number, because it is divible by the number of its divisors (1200).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 464939979 + ... + 464940021.

Almost surely, 2^19992420000 is an apocalyptic number.

19992420000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19992420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44008737696).

19992420000 is an abundant number, since it is smaller than the sum of its proper divisors (68025055392).

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

19992420000 is an equidigital number, since it uses as much as digits as its factorization.

19992420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

Adding to 19992420000 its reverse (2429991), we get a palindrome (19994849991).

The spelling of 19992420000 in words is "nineteen billion, nine hundred ninety-two million, four hundred twenty thousand".