19722794520 has 256 divisors, whose sum is σ = 71131737600. Its totient is φ = 4310691840.

The previous prime is 19722794519. The next prime is 19722794551. The reversal of 19722794520 is 2549722791.

It is a self number, because there is not a number n which added to its sum of digits gives 19722794520.

It is a congruent number.

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, 724516 + ... + 751244.

It is an arithmetic number, because the mean of its divisors is an integer number (277858350).

Almost surely, 2^19722794520 is an apocalyptic number.

19722794520 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 19722794520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35565868800).

19722794520 is an abundant number, since it is smaller than the sum of its proper divisors (51408943080).

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

19722794520 is a wasteful number, since it uses less digits than its factorization.

19722794520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26810 (or 26806 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 19722794520 in words is "nineteen billion, seven hundred twenty-two million, seven hundred ninety-four thousand, five hundred twenty".