19941644 has 12 divisors (see below), whose sum is σ = 36415344. Its totient is φ = 9537264.

The previous prime is 19941643. The next prime is 19941653. The reversal of 19941644 is 44614991.

It is a junction number, because it is equal to n+sod(n) for n = 19941598 and 19941607.

It is not an unprimeable number, because it can be changed into a prime (19941641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108287 + ... + 108470.

It is an arithmetic number, because the mean of its divisors is an integer number (3034612).

Almost surely, 2^19941644 is an apocalyptic number.

It is an amenable number.

19941644 is a deficient number, since it is larger than the sum of its proper divisors (16473700).

19941644 is a wasteful number, since it uses less digits than its factorization.

19941644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216784 (or 216782 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 19941644 is about 4465.6067896760. The cubic root of 19941644 is about 271.1775002145.

The spelling of 19941644 in words is "nineteen million, nine hundred forty-one thousand, six hundred forty-four".