19800745 has 8 divisors (see below), whose sum is σ = 24340680. Its totient is φ = 15454080.

The previous prime is 19800743. The next prime is 19800749. The reversal of 19800745 is 54700891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1172889 + 18627856 = 1083^2 + 4316^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19800745 - 2¹ = 19800743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19800745.

It is not an unprimeable number, because it can be changed into a prime (19800743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48090 + ... + 48499.

It is an arithmetic number, because the mean of its divisors is an integer number (3042585).

Almost surely, 2^19800745 is an apocalyptic number.

It is an amenable number.

19800745 is a deficient number, since it is larger than the sum of its proper divisors (4539935).

19800745 is an equidigital number, since it uses as much as digits as its factorization.

19800745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96635.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 19800745 is about 4449.8028046195. The cubic root of 19800745 is about 270.5373159171.

The spelling of 19800745 in words is "nineteen million, eight hundred thousand, seven hundred forty-five".