19994445 has 20 divisors (see below), whose sum is σ = 35842620. Its totient is φ = 10663488.

The previous prime is 19994413. The next prime is 19994449. The reversal of 19994445 is 54449991.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 14768649 = 2286^2 + 3843^2 .

It is not a de Polignac number, because 19994445 - 2⁵ = 19994413 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19994445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994449) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24280 + ... + 25089.

It is an arithmetic number, because the mean of its divisors is an integer number (1792131).

Almost surely, 2^19994445 is an apocalyptic number.

19994445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19994445 is a deficient number, since it is larger than the sum of its proper divisors (15848175).

19994445 is an equidigital number, since it uses as much as digits as its factorization.

19994445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49386 (or 49377 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 19994445 is about 4471.5148439874. The cubic root of 19994445 is about 271.4166283493.

The spelling of 19994445 in words is "nineteen million, nine hundred ninety-four thousand, four hundred forty-five".