19927497744 has 320 divisors, whose sum is σ = 71917301760. Its totient is φ = 5174928000.

The previous prime is 19927497743. The next prime is 19927497761. The reversal of 19927497744 is 44779472991.

19927497744 is a `hidden beast` number, since 19 + 92 + 7 + 497 + 7 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (19927497743) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4022469 + ... + 4027419.

It is an arithmetic number, because the mean of its divisors is an integer number (224741568).

Almost surely, 2^19927497744 is an apocalyptic number.

19927497744 is a gapful number since it is divisible by the number (14) 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 19927497744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35958650880).

19927497744 is an abundant number, since it is smaller than the sum of its proper divisors (51989804016).

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

19927497744 is a wasteful number, since it uses less digits than its factorization.

19927497744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008 (or 4974 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 63.

The spelling of 19927497744 in words is "nineteen billion, nine hundred twenty-seven million, four hundred ninety-seven thousand, seven hundred forty-four".