19805902141 has 16 divisors (see below), whose sum is σ = 20320554240. Its totient is φ = 19299323200.

The previous prime is 19805902133. The next prime is 19805902177. The reversal of 19805902141 is 14120950891.

It is a cyclic number.

It is not a de Polignac number, because 19805902141 - 2³ = 19805902133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19805902094 and 19805902103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19805902111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2250636 + ... + 2259418.

It is an arithmetic number, because the mean of its divisors is an integer number (1270034640).

Almost surely, 2^19805902141 is an apocalyptic number.

It is an amenable number.

19805902141 is a deficient number, since it is larger than the sum of its proper divisors (514652099).

19805902141 is a wasteful number, since it uses less digits than its factorization.

19805902141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9236.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 19805902141 in words is "nineteen billion, eight hundred five million, nine hundred two thousand, one hundred forty-one".