19724399250 has 128 divisors (see below), whose sum is σ = 50109456384. Its totient is φ = 5166720000.

The previous prime is 19724399249. The next prime is 19724399293. The reversal of 19724399250 is 5299342791.

It is a junction number, because it is equal to n+sod(n) for n = 19724399193 and 19724399202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17136175 + ... + 17137325.

It is an arithmetic number, because the mean of its divisors is an integer number (391480128).

Almost surely, 2^19724399250 is an apocalyptic number.

19724399250 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 19724399250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25054728192).

19724399250 is an abundant number, since it is smaller than the sum of its proper divisors (30385057134).

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

19724399250 is a wasteful number, since it uses less digits than its factorization.

19724399250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 19724399250 in words is "nineteen billion, seven hundred twenty-four million, three hundred ninety-nine thousand, two hundred fifty".