19909774404 has 243 divisors, whose sum is σ = 57447004797. Its totient is φ = 6034650336.

The previous prime is 19909774399. The next prime is 19909774411. The reversal of 19909774404 is 40447790991.

The square root of 19909774404 is 141102.

It is a perfect power (a square), and thus also a powerful number.

19909774404 is a `hidden beast` number, since 199 + 0 + 9 + 7 + 7 + 440 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2945232900 + 16964541504 = 54270^2 + 130248^2 .

It is a tau number, because it is divible by the number of its divisors (243).

It is a super-3 number, since 3×19909774404³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 297160779 + ... + 297160845.

Almost surely, 2^19909774404 is an apocalyptic number.

19909774404 is the 141102-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19909774404

19909774404 is an abundant number, since it is smaller than the sum of its proper divisors (37537230393).

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

19909774404 is an frugal number, since it uses more digits than its factorization.

19909774404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 19909774404 in words is "nineteen billion, nine hundred nine million, seven hundred seventy-four thousand, four hundred four".