19722481 has 3 divisors (see below), whose sum is σ = 19726923. Its totient is φ = 19718040.

The previous prime is 19722473. The next prime is 19722487. The reversal of 19722481 is 18422791.

The square root of 19722481 is 4441.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 7612081 + 12110400 = 2759^2 + 3480^2 .

It is not a de Polignac number, because 19722481 - 2³ = 19722473 is a prime.

It is a super-2 number, since 2×19722481² = 777952513590722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19722487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2221 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (6575641).

Almost surely, 2^19722481 is an apocalyptic number.

19722481 is the 4441-st square number.

19722481 is the 2221-st centered octagonal number.

It is an amenable number.

19722481 is a deficient number, since it is larger than the sum of its proper divisors (4442).

19722481 is an frugal number, since it uses more digits than its factorization.

19722481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8882 (or 4441 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The cubic root of 19722481 is about 270.1804052667.

It can be divided in two parts, 19 and 722481, that added together give a square (722500 = 850²).

The spelling of 19722481 in words is "nineteen million, seven hundred twenty-two thousand, four hundred eighty-one".