19431377920 has 88 divisors (see below), whose sum is σ = 46714243104. Its totient is φ = 7755595776.

The previous prime is 19431377869. The next prime is 19431377923. The reversal of 19431377920 is 2977313491.

It is not an unprimeable number, because it can be changed into a prime (19431377923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2489544 + ... + 2497336.

Almost surely, 2^19431377920 is an apocalyptic number.

19431377920 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 19431377920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23357121552).

19431377920 is an abundant number, since it is smaller than the sum of its proper divisors (27282865184).

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

19431377920 is an equidigital number, since it uses as much as digits as its factorization.

19431377920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8305 (or 8287 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 46.

The spelling of 19431377920 in words is "nineteen billion, four hundred thirty-one million, three hundred seventy-seven thousand, nine hundred twenty".