19805901962 has 32 divisors (see below), whose sum is σ = 37156544640. Its totient is φ = 7692223680.

The previous prime is 19805901961. The next prime is 19805902049. The reversal of 19805901962 is 26910950891.

It is a self number, because there is not a number n which added to its sum of digits gives 19805901962.

It is not an unprimeable number, because it can be changed into a prime (19805901961) 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 15 ways as a sum of consecutive naturals, for example, 154037 + ... + 251672.

It is an arithmetic number, because the mean of its divisors is an integer number (1161142020).

Almost surely, 2^19805901962 is an apocalyptic number.

19805901962 is a deficient number, since it is larger than the sum of its proper divisors (17350642678).

19805901962 is a wasteful number, since it uses less digits than its factorization.

19805901962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406046.

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 19805901962 in words is "nineteen billion, eight hundred five million, nine hundred one thousand, nine hundred sixty-two".