19999841 has 8 divisors (see below), whose sum is σ = 20546568. Its totient is φ = 19456000.

The previous prime is 19999831. The next prime is 19999843. The reversal of 19999841 is 14899991.

It can be written as a sum of positive squares in 4 ways, for example, as 10000 + 19989841 = 100^2 + 4471^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19999841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19999841.

It is not an unprimeable number, because it can be changed into a prime (19999843) 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, 25901 + ... + 26661.

It is an arithmetic number, because the mean of its divisors is an integer number (2568321).

Almost surely, 2^19999841 is an apocalyptic number.

It is an amenable number.

19999841 is a deficient number, since it is larger than the sum of its proper divisors (546727).

19999841 is an equidigital number, since it uses as much as digits as its factorization.

19999841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 209952, while the sum is 50.

The square root of 19999841 is about 4472.1181782238. The cubic root of 19999841 is about 271.4410423369.

It can be divided in two parts, 199998 and 41, that multiplied together give a palindrome (8199918).

The spelling of 19999841 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred forty-one".