19956841 has 4 divisors (see below), whose sum is σ = 20031300. Its totient is φ = 19882384.

The previous prime is 19956829. The next prime is 19956851. The reversal of 19956841 is 14865991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3594816 + 16362025 = 1896^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 19956841 - 2⁹ = 19956329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19956851) 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, 36826 + ... + 37363.

It is an arithmetic number, because the mean of its divisors is an integer number (5007825).

Almost surely, 2^19956841 is an apocalyptic number.

It is an amenable number.

19956841 is a deficient number, since it is larger than the sum of its proper divisors (74459).

19956841 is an equidigital number, since it uses as much as digits as its factorization.

19956841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74458.

The product of its digits is 77760, while the sum is 43.

The square root of 19956841 is about 4467.3080260936. The cubic root of 19956841 is about 271.2463684592.

It can be divided in two parts, 1995 and 6841, that added together give a square (8836 = 94²).

The spelling of 19956841 in words is "nineteen million, nine hundred fifty-six thousand, eight hundred forty-one".