19694424672 has 384 divisors, whose sum is σ = 63707212800. Its totient is φ = 5881946112.

The previous prime is 19694424671. The next prime is 19694424733. The reversal of 19694424672 is 27642449691.

19694424672 is a `hidden beast` number, since 1 + 96 + 9 + 442 + 46 + 72 = 666.

It is a super-2 number, since 2×19694424672² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19694424671) 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 63 ways as a sum of consecutive naturals, for example, 74883613 + ... + 74883875.

It is an arithmetic number, because the mean of its divisors is an integer number (165904200).

Almost surely, 2^19694424672 is an apocalyptic number.

19694424672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19694424672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31853606400).

19694424672 is an abundant number, since it is smaller than the sum of its proper divisors (44012788128).

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

19694424672 is a wasteful number, since it uses less digits than its factorization.

19694424672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 453 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 19694424672 in words is "nineteen billion, six hundred ninety-four million, four hundred twenty-four thousand, six hundred seventy-two".