19689445090 has 256 divisors, whose sum is σ = 45519667200. Its totient is φ = 6109931520.

The previous prime is 19689445063. The next prime is 19689445093. The reversal of 19689445090 is 9054498691.

It is not an unprimeable number, because it can be changed into a prime (19689445093) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 202983922 + ... + 202984018.

It is an arithmetic number, because the mean of its divisors is an integer number (177811200).

Almost surely, 2^19689445090 is an apocalyptic number.

19689445090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19689445090 is an abundant number, since it is smaller than the sum of its proper divisors (25830222110).

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

19689445090 is a wasteful number, since it uses less digits than its factorization.

19689445090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 19689445090 in words is "nineteen billion, six hundred eighty-nine million, four hundred forty-five thousand, ninety".