19722340 has 48 divisors (see below), whose sum is σ = 45549504. Its totient is φ = 7113600.

The previous prime is 19722317. The next prime is 19722341. The reversal of 19722340 is 4322791.

19722340 is a nontrivial binomial coefficient, being equal to C(6281, 2).

It is a junction number, because it is equal to n+sod(n) for n = 19722299 and 19722308.

It is not an unprimeable number, because it can be changed into a prime (19722341) 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 15 ways as a sum of consecutive naturals, for example, 34255 + ... + 34825.

It is an arithmetic number, because the mean of its divisors is an integer number (948948).

Almost surely, 2^19722340 is an apocalyptic number.

19722340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19722340 is the 6280-th triangular number.

19722340 is the 2094-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19722340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22774752).

19722340 is an abundant number, since it is smaller than the sum of its proper divisors (25827164).

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

19722340 is a wasteful number, since it uses less digits than its factorization.

19722340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 746 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 19722340 is about 4440.9841251687. The cubic root of 19722340 is about 270.1797614070.

The spelling of 19722340 in words is "nineteen million, seven hundred twenty-two thousand, three hundred forty".