19965750 has 64 divisors (see below), whose sum is σ = 56968704. Its totient is φ = 4562400.

The previous prime is 19965739. The next prime is 19965761. The reversal of 19965750 is 5756991.

It is an interprime number because it is at equal distance from previous prime (19965739) and next prime (19965761).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3349 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (890136).

Almost surely, 2^19965750 is an apocalyptic number.

19965750 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 19965750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28484352).

19965750 is an abundant number, since it is smaller than the sum of its proper divisors (37002954).

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

19965750 is a wasteful number, since it uses less digits than its factorization.

19965750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830 (or 3820 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 19965750 is about 4468.3050477782. The cubic root of 19965750 is about 271.2867251201.

The spelling of 19965750 in words is "nineteen million, nine hundred sixty-five thousand, seven hundred fifty".