19968750 has 84 divisors (see below), whose sum is σ = 54843048. Its totient is φ = 5250000.

The previous prime is 19968737. The next prime is 19968769. The reversal of 19968750 is 5786991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 19968696 and 19968705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 281215 + ... + 281285.

Almost surely, 2^19968750 is an apocalyptic number.

19968750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19968750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27421524).

19968750 is an abundant number, since it is smaller than the sum of its proper divisors (34874298).

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

19968750 is an frugal number, since it uses more digits than its factorization.

19968750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 19968750 is about 4468.6407329299. The cubic root of 19968750 is about 271.3003120447.

The spelling of 19968750 in words is "nineteen million, nine hundred sixty-eight thousand, seven hundred fifty".