19906824971 has 4 divisors (see below), whose sum is σ = 21716536344. Its totient is φ = 18097113600.

The previous prime is 19906824941. The next prime is 19906825051. The reversal of 19906824971 is 17942860991.

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

It is a cyclic number.

It is not a de Polignac number, because 19906824971 - 2¹⁴ = 19906808587 is a prime.

It is a super-3 number, since 3×19906824971³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19906824901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904855670 + ... + 904855691.

It is an arithmetic number, because the mean of its divisors is an integer number (5429134086).

Almost surely, 2^19906824971 is an apocalyptic number.

19906824971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19906824971 is a deficient number, since it is larger than the sum of its proper divisors (1809711373).

19906824971 is a wasteful number, since it uses less digits than its factorization.

19906824971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809711372.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 19906824971 in words is "nineteen billion, nine hundred six million, eight hundred twenty-four thousand, nine hundred seventy-one".