19406079720 has 48 divisors (see below), whose sum is σ = 63069760260. Its totient is φ = 5174954496.

The previous prime is 19406079709. The next prime is 19406079769. The reversal of 19406079720 is 2797060491.

19406079720 is a `hidden beast` number, since 19 + 4 + 0 + 607 + 9 + 7 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19298210724 + 107868996 = 138918^2 + 10386^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26952529 + ... + 26953248.

Almost surely, 2^19406079720 is an apocalyptic number.

19406079720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19406079720 is an abundant number, since it is smaller than the sum of its proper divisors (43663680540).

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

19406079720 is a wasteful number, since it uses less digits than its factorization.

19406079720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53905794 (or 53905787 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 19406079720 in words is "nineteen billion, four hundred six million, seventy-nine thousand, seven hundred twenty".