19995720 has 32 divisors (see below), whose sum is σ = 59987520. Its totient is φ = 5332160.

The previous prime is 19995707. The next prime is 19995721. The reversal of 19995720 is 2759991.

It is not an unprimeable number, because it can be changed into a prime (19995721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83196 + ... + 83435.

It is an arithmetic number, because the mean of its divisors is an integer number (1874610).

Almost surely, 2^19995720 is an apocalyptic number.

19995720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19995720 is an abundant number, since it is smaller than the sum of its proper divisors (39991800).

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

19995720 is a wasteful number, since it uses less digits than its factorization.

19995720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166645 (or 166641 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 19995720 is about 4471.6574108489. The cubic root of 19995720 is about 271.4223974324.

The spelling of 19995720 in words is "nineteen million, nine hundred ninety-five thousand, seven hundred twenty".