19923447630 has 64 divisors (see below), whose sum is σ = 48572275968. Its totient is φ = 5229058560.

The previous prime is 19923447569. The next prime is 19923447637. The reversal of 19923447630 is 3674432991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19923447630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19923447637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2731969 + ... + 2739251.

It is an arithmetic number, because the mean of its divisors is an integer number (758941812).

Almost surely, 2^19923447630 is an apocalyptic number.

19923447630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19923447630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24286137984).

19923447630 is an abundant number, since it is smaller than the sum of its proper divisors (28648828338).

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

19923447630 is a wasteful number, since it uses less digits than its factorization.

19923447630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8721.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 19923447630 in words is "nineteen billion, nine hundred twenty-three million, four hundred forty-seven thousand, six hundred thirty".