19843980836 has 18 divisors (see below), whose sum is σ = 36650900790. Its totient is φ = 9399779712.

The previous prime is 19843980797. The next prime is 19843980899. The reversal of 19843980836 is 63808934891.

It can be written as a sum of positive squares in only one way, i.e., 13698361600 + 6145619236 = 117040^2 + 78394^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6869741 + ... + 6872628.

It is an arithmetic number, because the mean of its divisors is an integer number (2036161155).

Almost surely, 2^19843980836 is an apocalyptic number.

It is an amenable number.

19843980836 is a deficient number, since it is larger than the sum of its proper divisors (16806919954).

19843980836 is a wasteful number, since it uses less digits than its factorization.

19843980836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13742411 (or 13742390 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 19843980836 in words is "nineteen billion, eight hundred forty-three million, nine hundred eighty thousand, eight hundred thirty-six".