19946409120 has 144 divisors (see below), whose sum is σ = 74255100192. Its totient is φ = 4835489280.

The previous prime is 19946409079. The next prime is 19946409127. The reversal of 19946409120 is 2190464991.

19946409120 is a `hidden beast` number, since 199 + 46 + 409 + 12 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is not an unprimeable number, because it can be changed into a prime (19946409127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 613782 + ... + 645461.

It is an arithmetic number, because the mean of its divisors is an integer number (515660418).

Almost surely, 2^19946409120 is an apocalyptic number.

19946409120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19946409120 is an abundant number, since it is smaller than the sum of its proper divisors (54308691072).

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

19946409120 is a wasteful number, since it uses less digits than its factorization.

19946409120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259275 (or 1259264 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 19946409120 in words is "nineteen billion, nine hundred forty-six million, four hundred nine thousand, one hundred twenty".