19905299764 has 96 divisors (see below), whose sum is σ = 44265267200. Its totient is φ = 7638986880.

The previous prime is 19905299753. The next prime is 19905299789. The reversal of 19905299764 is 46799250991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 695122 + ... + 723190.

Almost surely, 2^19905299764 is an apocalyptic number.

19905299764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19905299764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22132633600).

19905299764 is an abundant number, since it is smaller than the sum of its proper divisors (24359967436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19905299764 is a wasteful number, since it uses less digits than its factorization.

19905299764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28173 (or 28171 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 61.

The spelling of 19905299764 in words is "nineteen billion, nine hundred five million, two hundred ninety-nine thousand, seven hundred sixty-four".