19806704641 has 32 divisors (see below), whose sum is σ = 22476165120. Its totient is φ = 17342035200.

The previous prime is 19806704597. The next prime is 19806704647. The reversal of 19806704641 is 14640760891.

It is a cyclic number.

It is not a de Polignac number, because 19806704641 - 2⁷ = 19806704513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19806704591 and 19806704600.

It is not an unprimeable number, because it can be changed into a prime (19806704647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6213250 + ... + 6216436.

It is an arithmetic number, because the mean of its divisors is an integer number (702380160).

Almost surely, 2^19806704641 is an apocalyptic number.

It is an amenable number.

19806704641 is a deficient number, since it is larger than the sum of its proper divisors (2669460479).

19806704641 is a wasteful number, since it uses less digits than its factorization.

19806704641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 19806704641 in words is "nineteen billion, eight hundred six million, seven hundred four thousand, six hundred forty-one".