19906641 has 20 divisors (see below), whose sum is σ = 30304692. Its totient is φ = 13017888.

The previous prime is 19906639. The next prime is 19906651. The reversal of 19906641 is 14660991.

19906641 is a `hidden beast` number, since 1 + 9 + 9 + 0 + 6 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 10265616 = 3105^2 + 3204^2 .

It is not a de Polignac number, because 19906641 - 2¹ = 19906639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19906596 and 19906605.

It is not an unprimeable number, because it can be changed into a prime (19906651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1975 + ... + 6611.

Almost surely, 2^19906641 is an apocalyptic number.

It is an amenable number.

19906641 is a deficient number, since it is larger than the sum of its proper divisors (10398051).

19906641 is an equidigital number, since it uses as much as digits as its factorization.

19906641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702 (or 4693 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19906641 is about 4461.6858921264. The cubic root of 19906641 is about 271.0187439094.

The spelling of 19906641 in words is "nineteen million, nine hundred six thousand, six hundred forty-one".