19964445 has 8 divisors (see below), whose sum is σ = 31943136. Its totient is φ = 10647696.

The previous prime is 19964429. The next prime is 19964447. The reversal of 19964445 is 54446991.

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

It is not a de Polignac number, because 19964445 - 2⁴ = 19964429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19964397 and 19964406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19964447) 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, 665467 + ... + 665496.

It is an arithmetic number, because the mean of its divisors is an integer number (3992892).

Almost surely, 2^19964445 is an apocalyptic number.

19964445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19964445 is a deficient number, since it is larger than the sum of its proper divisors (11978691).

19964445 is a wasteful number, since it uses less digits than its factorization.

19964445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330971.

The product of its digits is 155520, while the sum is 42.

The square root of 19964445 is about 4468.1590168659. The cubic root of 19964445 is about 271.2808143832.

It can be divided in two parts, 1996 and 4445, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 19964445 in words is "nineteen million, nine hundred sixty-four thousand, four hundred forty-five".