19927305840 has 160 divisors (see below), whose sum is σ = 67051708416. Its totient is φ = 4866462720.

The previous prime is 19927305817. The next prime is 19927305841. The reversal of 19927305840 is 4850372991.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 19927305840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19927305841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371095 + ... + 421385.

Almost surely, 2^19927305840 is an apocalyptic number.

19927305840 is a gapful number since it is divisible by the number (10) 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 19927305840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33525854208).

19927305840 is an abundant number, since it is smaller than the sum of its proper divisors (47124402576).

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

19927305840 is a wasteful number, since it uses less digits than its factorization.

19927305840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50447 (or 50441 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 19927305840 in words is "nineteen billion, nine hundred twenty-seven million, three hundred five thousand, eight hundred forty".