19997071941 has 48 divisors (see below), whose sum is σ = 33865026048. Its totient is φ = 10379023200.

The previous prime is 19997071931. The next prime is 19997071943. The reversal of 19997071941 is 14917079991.

It is not a de Polignac number, because 19997071941 - 2⁵ = 19997071909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19997071943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2102206 + ... + 2111696.

It is an arithmetic number, because the mean of its divisors is an integer number (705521376).

Almost surely, 2^19997071941 is an apocalyptic number.

19997071941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19997071941 is a deficient number, since it is larger than the sum of its proper divisors (13867954107).

19997071941 is a wasteful number, since it uses less digits than its factorization.

19997071941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10822 (or 10815 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 57.

The spelling of 19997071941 in words is "nineteen billion, nine hundred ninety-seven million, seventy-one thousand, nine hundred forty-one".