19904284660 has 24 divisors (see below), whose sum is σ = 45014305896. Its totient is φ = 7349274240.

The previous prime is 19904284657. The next prime is 19904284679. The reversal of 19904284660 is 6648240991.

It can be written as a sum of positive squares in 4 ways, for example, as 91470096 + 19812814564 = 9564^2 + 140758^2 .

It is a super-2 number, since 2×19904284660² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 38277211 + ... + 38277730.

It is an arithmetic number, because the mean of its divisors is an integer number (1875596079).

Almost surely, 2^19904284660 is an apocalyptic number.

19904284660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19904284660 is an abundant number, since it is smaller than the sum of its proper divisors (25110021236).

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

19904284660 is a wasteful number, since it uses less digits than its factorization.

19904284660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76554963 (or 76554961 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 19904284660 in words is "nineteen billion, nine hundred four million, two hundred eighty-four thousand, six hundred sixty".